Sleepy Princess in the Demon Castle
21 primary works • 26 total works
Book 1
A captured princess just wants a good night’s sleep! Imprisoned in the castle of the Demon King, all that spoiled-sweet Princess Syalis dreams of is a good night’s sleep! Shhh... Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is...bored. She decides to while away the hours by sleeping, but getting a good night’s rest turns out to be a lot of work! She begins by fashioning a DIY pillow out of the fur of her Teddy demon guards and an “air mattress” from the magical Shield of the Wielder of the Wind. The princess’s hapless demonic guards soon discover that their captive expects to be treated like, well, a princess. Things go from to bad to worse—for her captors—when some of Princess Syalis’s schemes end in her untimely—if temporary—demise and she chooses the Forbidden Grimoire for her bedtime reading...
Book 2
A captured princess just wants a good night’s sleep!
Imprisoned in the castle of the Demon King, all that spoiled-sweet Princess Syalis dreams of is a good night’s sleep! Shhh...
While waiting to be rescued, Princess Syalis makes herself at home by commandeering a bathtub, befriending a girl demon and participating in a castle fitness challenge. Her plots to get some shut-eye include stealing ice from Frost Demons to cool off on a hot summer night, attempting to make her own DIY waterbed, toying with magic spells and provoking an enchanted flower into releasing a soporific. And then the nightmares begin...
A lovable fantasy series with a cute princess, adorable demons and a charming prince...of evil.
* Releases 4 times a year for 4+ volumes. Series is ongoing.
* A quirky take on supernatural fantasy that borrows elements from Japanese role-playing video games to appeal to fans of hit video games such as Disgaea.
* Recently a handful of manga series similar to Sleepy Princess in the Demon Castle that borrow elements from Japanese role playing games have become best-sellers, including Black Clover and Delicious in Dungeon.
Imprisoned in the castle of the Demon King, all that spoiled-sweet Princess Syalis dreams of is a good night’s sleep! Shhh...
While waiting to be rescued, Princess Syalis makes herself at home by commandeering a bathtub, befriending a girl demon and participating in a castle fitness challenge. Her plots to get some shut-eye include stealing ice from Frost Demons to cool off on a hot summer night, attempting to make her own DIY waterbed, toying with magic spells and provoking an enchanted flower into releasing a soporific. And then the nightmares begin...
A lovable fantasy series with a cute princess, adorable demons and a charming prince...of evil.
* Releases 4 times a year for 4+ volumes. Series is ongoing.
* A quirky take on supernatural fantasy that borrows elements from Japanese role-playing video games to appeal to fans of hit video games such as Disgaea.
* Recently a handful of manga series similar to Sleepy Princess in the Demon Castle that borrow elements from Japanese role playing games have become best-sellers, including Black Clover and Delicious in Dungeon.
Book 3
A captured princess just wants a good night’s sleep! Shhh…
Imprisoned in the castle of the Demon King, all spoiled-sweet Princess Syalis dreams of is a good night’s sleep! Shhh...
Winter has come, and Princess Syalis will do anything to stay warm, including creating a DIY magical device (known as a kotatsu), knitting long underwear and trying to convince the castle blacksmith to make her a window that keeps out drafts. When she accidentally dies yet again—along with Stamper Cat—curious resurrection complications ensue. Then it’s Christmas and New Year’s! Who will the Demon King designate as naughty or nice? And will all of the other demons let poor Syalis play in any demon games…?
Now the Demon King has insomnia…
Imprisoned in the castle of the Demon King, all spoiled-sweet Princess Syalis dreams of is a good night’s sleep! Shhh...
Winter has come, and Princess Syalis will do anything to stay warm, including creating a DIY magical device (known as a kotatsu), knitting long underwear and trying to convince the castle blacksmith to make her a window that keeps out drafts. When she accidentally dies yet again—along with Stamper Cat—curious resurrection complications ensue. Then it’s Christmas and New Year’s! Who will the Demon King designate as naughty or nice? And will all of the other demons let poor Syalis play in any demon games…?
Now the Demon King has insomnia…
Book 4
A captured princess just wants a good night’s sleep! Shhh…
Imprisoned in the castle of the Demon King, all spoiled-sweet Princess Syalis dreams of is a good night’s sleep! Shhh...
Valentine’s Day arrives and Princess Syalis is hard put to get the haul of chocolate she’s accustomed to receiving back home in her kingdom. Her latest plots to get a better night’s rest include learning to hibernate, becoming a ghost and getting an annoying earworm out of her head. And how can she put a stop to the Teddy Demons summoning her every time they get into a kerfuffle…?
Then the princess gets kidnapped from her kidnappers!
Imprisoned in the castle of the Demon King, all spoiled-sweet Princess Syalis dreams of is a good night’s sleep! Shhh...
Valentine’s Day arrives and Princess Syalis is hard put to get the haul of chocolate she’s accustomed to receiving back home in her kingdom. Her latest plots to get a better night’s rest include learning to hibernate, becoming a ghost and getting an annoying earworm out of her head. And how can she put a stop to the Teddy Demons summoning her every time they get into a kerfuffle…?
Then the princess gets kidnapped from her kidnappers!
Book 5
A captured princess just wants a good night’s sleep! Shhh…
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
Princess Syalis comes to the surprising conclusion that being good will earn her a good night’s sleep! But none of the demons trust her sudden transformation. The princess’s latest dilemmas include a growing urge to use the bathroom when it’s out of order, her pet Eggplant Seal outgrowing her quarters, and growing into a giant instead of up. And then it’s time for the castle’s Hostage Reeducation Week… Plus, a visit to demon preschool!
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
Princess Syalis comes to the surprising conclusion that being good will earn her a good night’s sleep! But none of the demons trust her sudden transformation. The princess’s latest dilemmas include a growing urge to use the bathroom when it’s out of order, her pet Eggplant Seal outgrowing her quarters, and growing into a giant instead of up. And then it’s time for the castle’s Hostage Reeducation Week… Plus, a visit to demon preschool!
Book 6
A captured princess just wants a good night’s sleep! Shhh…
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
Accompanied by an entourage of demon guards, Princess Syalis takes a field trip to the human world to acquire a special pillow. Then she receives several invitations from her demon captors: first, to replace the cooks who have succumbed to heat exhaustion in the Demon Castle kitchen (somebody needs to make Quilladillo’s Monster Bird Egg Custard); second, to attend a pajama party (despite being woefully ignorant of the concept); and third, to design a new area for the hero to explore (which turns out to be the exact opposite of what the demons commissioned).
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
Accompanied by an entourage of demon guards, Princess Syalis takes a field trip to the human world to acquire a special pillow. Then she receives several invitations from her demon captors: first, to replace the cooks who have succumbed to heat exhaustion in the Demon Castle kitchen (somebody needs to make Quilladillo’s Monster Bird Egg Custard); second, to attend a pajama party (despite being woefully ignorant of the concept); and third, to design a new area for the hero to explore (which turns out to be the exact opposite of what the demons commissioned).
Book 7
A captured princess just wants a good night’s sleep! Shhh…
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
Princess Syalis manages to mess up Christmas and Valentine’s Day…again. Then, when Syalis and her demon captors pay a visit to her kingdom of Goodereste, a demon stands in for the princess…and winds up needing to be kidnapped herself! A common enemy forces Syalis and her archnemesis Poseidon to team up. And Syalis messes up more things, including a Demon Castle hot pot party and a Demon King educational biopic. But she still manages to find some good opportunities for relaxing naps…
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
Princess Syalis manages to mess up Christmas and Valentine’s Day…again. Then, when Syalis and her demon captors pay a visit to her kingdom of Goodereste, a demon stands in for the princess…and winds up needing to be kidnapped herself! A common enemy forces Syalis and her archnemesis Poseidon to team up. And Syalis messes up more things, including a Demon Castle hot pot party and a Demon King educational biopic. But she still manages to find some good opportunities for relaxing naps…
Book 8
A captured princess just wants a good night’s sleep! Shhh…
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
Princess Syalis’s luxurious lifestyle is wreaking havoc on the Demon Castle’s budget! When the Demon King cuts back on expenses so that she is no longer supported in the style she is accustomed to, the princess must find other strategies to satisfy her extravagant taste. Then, when the newly hired demon staff arrive for their orientation at the Demon Castle—complete with a hot springs retreat—the current staff is loath to admit that they’ve lost control of their hostage. What will happen when the newbies discover that the “Scissors Demon” joining in their training is actually a terrifying, bratty human girl?!
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
Princess Syalis’s luxurious lifestyle is wreaking havoc on the Demon Castle’s budget! When the Demon King cuts back on expenses so that she is no longer supported in the style she is accustomed to, the princess must find other strategies to satisfy her extravagant taste. Then, when the newly hired demon staff arrive for their orientation at the Demon Castle—complete with a hot springs retreat—the current staff is loath to admit that they’ve lost control of their hostage. What will happen when the newbies discover that the “Scissors Demon” joining in their training is actually a terrifying, bratty human girl?!
Book 9
A captured princess just wants a good night’s sleep! Shhh…
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
Princess Syalis has a new admirer, and the other demons are jealous—one in particular. How far will he go to dissuade her weaselly suitor? Then summer arrives! Syalis tries to cool off by telling ghost stories to make herself shiver but instead strikes fear into her demon captors’ hearts. Then the Demon Cleric botches a resurrection, accidentally merging himself with another, cuter demon. And finally it’s time for the Demon Castle Super Summer Festival! Naturally Syalis enters the beauty pageant. Who will be her competition? Wait—are those demons in drag...?!
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
Princess Syalis has a new admirer, and the other demons are jealous—one in particular. How far will he go to dissuade her weaselly suitor? Then summer arrives! Syalis tries to cool off by telling ghost stories to make herself shiver but instead strikes fear into her demon captors’ hearts. Then the Demon Cleric botches a resurrection, accidentally merging himself with another, cuter demon. And finally it’s time for the Demon Castle Super Summer Festival! Naturally Syalis enters the beauty pageant. Who will be her competition? Wait—are those demons in drag...?!
Book 10
A captured princess just wants a good night’s sleep! Shhh…
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
A lovable fantasy series with a cute princess, adorable demons and a charming prince…of evil.
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
A lovable fantasy series with a cute princess, adorable demons and a charming prince…of evil.
Book 11
A captured princess just wants a good night’s sleep! Shhh…
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
Celebrate New Year’s, Valentine’s Day and a very special pajama party at the Demon Castle with the princess and her demon friends—er, captors! Then the Five-ring-pics athletic tournament captures the imagination of demons and human alike. But when one of the athletes turns the demons’ human friend—er, hostage—into a besotted fangirl, the castle staff doesn’t take it well. Also, Syalis imbibes a potion that induces her greatest fear, Demon King Twilight desperately tries to change his image and the hero Dawner adds a certain someone to his unwelcome rescue party.
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
Celebrate New Year’s, Valentine’s Day and a very special pajama party at the Demon Castle with the princess and her demon friends—er, captors! Then the Five-ring-pics athletic tournament captures the imagination of demons and human alike. But when one of the athletes turns the demons’ human friend—er, hostage—into a besotted fangirl, the castle staff doesn’t take it well. Also, Syalis imbibes a potion that induces her greatest fear, Demon King Twilight desperately tries to change his image and the hero Dawner adds a certain someone to his unwelcome rescue party.
Book 12
A captured princess just wants a good night’s sleep! Shhh…
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
The Demon Castle staff procure a flock of Monster Bird chicks to ensure a steady supply of eggs, but their problems only grow. The princess’s efforts to help the Demon Castle weather a financial crisis range from the criminal to the musical. Mechanical Zone boss M.O.T.H.E.R. creates a mechanical marvel modeled after the most fearsome resident of the castle. Now who would that be…? And then the princess must operate the mecha in battle against the hero Dawner, who is determined to "rescue" her from her beloved new home. Plus, the secret of the Demon King’s horns and an herbaceous invasion!
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
The Demon Castle staff procure a flock of Monster Bird chicks to ensure a steady supply of eggs, but their problems only grow. The princess’s efforts to help the Demon Castle weather a financial crisis range from the criminal to the musical. Mechanical Zone boss M.O.T.H.E.R. creates a mechanical marvel modeled after the most fearsome resident of the castle. Now who would that be…? And then the princess must operate the mecha in battle against the hero Dawner, who is determined to "rescue" her from her beloved new home. Plus, the secret of the Demon King’s horns and an herbaceous invasion!
Book 13
A captured princess just wants a good night’s sleep! Shhh…
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
The Demon King and his troops travel to a demilitarized zone bordering the demon world and the human world for some intense physical training alongside their human counterparts. When one group mocks the other, Syalis is hell-bent on putting them in their place! While the Demon Castle recovers from boot camp, the princess saves the day…and wrecks it even more. Then, an integral member of the Demon Castle staff resigns and heads for home…with the rest of the demons and one human in hot pursuit!
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
The Demon King and his troops travel to a demilitarized zone bordering the demon world and the human world for some intense physical training alongside their human counterparts. When one group mocks the other, Syalis is hell-bent on putting them in their place! While the Demon Castle recovers from boot camp, the princess saves the day…and wrecks it even more. Then, an integral member of the Demon Castle staff resigns and heads for home…with the rest of the demons and one human in hot pursuit!
Book 14
A captured princess just wants a good night’s sleep! Shhh…
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
When things seem too peaceful in the Demon Castle, the demons investigate and find the princess in a literal bind. Having stolen a gizmo to create alternate dimensions, Princess Syalis uses it to do good in the world. Just kidding! Of course she uses it for her own (and the Teddy Demons’) selfish gain. Then, a lightning storm reveals one demon is (predictably) even more frightened of thunder than the princess. Quilladillo goes home for vacation only to discover he has a stowaway in his trunk, but it’s not the princess. Just kidding! Of course it is. And then a relative of the princess appears at the castle! What are the demon hostage takers to do…?!
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
When things seem too peaceful in the Demon Castle, the demons investigate and find the princess in a literal bind. Having stolen a gizmo to create alternate dimensions, Princess Syalis uses it to do good in the world. Just kidding! Of course she uses it for her own (and the Teddy Demons’) selfish gain. Then, a lightning storm reveals one demon is (predictably) even more frightened of thunder than the princess. Quilladillo goes home for vacation only to discover he has a stowaway in his trunk, but it’s not the princess. Just kidding! Of course it is. And then a relative of the princess appears at the castle! What are the demon hostage takers to do…?!
Book 20
A captured princess just wants a good night’s sleep! Shhh…
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
A secretly filmed video of life at the Demon Castle embarrasses its occupants. Agave finally confronts her demons—or rather, the Demon King. Then, when Princess Syalis messes with a magical spinning wheel, it’s Poseidon who takes the hit. To rescue the god of the sea, the princess must embark on a deep dive into the history of the spell and…her own family?! Plus, Twilight’s first love revealed! Sort of.
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
A secretly filmed video of life at the Demon Castle embarrasses its occupants. Agave finally confronts her demons—or rather, the Demon King. Then, when Princess Syalis messes with a magical spinning wheel, it’s Poseidon who takes the hit. To rescue the god of the sea, the princess must embark on a deep dive into the history of the spell and…her own family?! Plus, Twilight’s first love revealed! Sort of.
Book 21
A captured princess just wants a good night’s sleep! Shhh…
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
This time it’s the princess who gets shrunk to the size of a child, and with dire consequences…instigated by her, naturally. The mystery of why the Ten Guardians number only nine individuals is investigated…with mixed results. The search for a spy in the castle ends in…confusion. But at least the story of Demon Cleric’s transformation into a gentler, kinder demon is clarified. Plus, hypnosis, hot pot, and Midnight’s hound!
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
This time it’s the princess who gets shrunk to the size of a child, and with dire consequences…instigated by her, naturally. The mystery of why the Ten Guardians number only nine individuals is investigated…with mixed results. The search for a spy in the castle ends in…confusion. But at least the story of Demon Cleric’s transformation into a gentler, kinder demon is clarified. Plus, hypnosis, hot pot, and Midnight’s hound!
Book 22
A captured princess just wants a good night’s sleep! Shhh…
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is...bored.
The Monster Bird Egg Association’s efforts to poach Cursed Musician prove short-lived after Syalis realises Odile’s true motivations. Meanwhile, Silmoth brings some much-needed experience and dignity back to the Ten Guardians—right up until the princess enters the scene—and the residents of the Demon Castle discover the power of partying. Twilight is forced to decide whether a personal invitation to the Wild Avian Hotel is a deadly trap or a fun-filled opportunity. Plus, puppies powering up, popularity polls, and pugnacious plants!
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is...bored.
The Monster Bird Egg Association’s efforts to poach Cursed Musician prove short-lived after Syalis realises Odile’s true motivations. Meanwhile, Silmoth brings some much-needed experience and dignity back to the Ten Guardians—right up until the princess enters the scene—and the residents of the Demon Castle discover the power of partying. Twilight is forced to decide whether a personal invitation to the Wild Avian Hotel is a deadly trap or a fun-filled opportunity. Plus, puppies powering up, popularity polls, and pugnacious plants!
Book 23
A captured princess just wants a good night’s sleep! Shhh…
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
Alraune’s showdown with the hero’s party is brought to an explosive end. Poseidon throws a fit when the construction of the gate between the castles is interrupted—again. Demon Cleric is definitely not at all jealous about the princess hanging out with Hypnos. Twilight and Hades both shrink shamefully after duking it out. And the princess dies again—but this time Demon Cleric can’t bring her back, demanding an impromptu trip to the Underworld and a shocking family reunion!
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
Alraune’s showdown with the hero’s party is brought to an explosive end. Poseidon throws a fit when the construction of the gate between the castles is interrupted—again. Demon Cleric is definitely not at all jealous about the princess hanging out with Hypnos. Twilight and Hades both shrink shamefully after duking it out. And the princess dies again—but this time Demon Cleric can’t bring her back, demanding an impromptu trip to the Underworld and a shocking family reunion!
Book 24
A captured princess just wants a good night’s sleep! Shhh…
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
Another milestone for the Demon Castle is (unintentionally) celebrated with surf, sand, and sun. Quilladillo discovers the hidden costs of fame, while Vampire discovers the incredible power of normalcy. A quest for a free pillow goes awry when a brief trip to the home of the Divinities results in Princess Syalis and Poseidon coming face-to-face with Somnus—the god of sleep. Plus, river races, idol groups, Angel Teddies, part-time jobs, and the Demon Castle residents like you’ve never seen them before!
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
Another milestone for the Demon Castle is (unintentionally) celebrated with surf, sand, and sun. Quilladillo discovers the hidden costs of fame, while Vampire discovers the incredible power of normalcy. A quest for a free pillow goes awry when a brief trip to the home of the Divinities results in Princess Syalis and Poseidon coming face-to-face with Somnus—the god of sleep. Plus, river races, idol groups, Angel Teddies, part-time jobs, and the Demon Castle residents like you’ve never seen them before!
Book 25
A captured princess just wants a good night’s sleep! Shhh…
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
The mysteries of the missing member of the Ten Guardians and the castle-wide gender swap are simultaneously solved. Bean-based holidays are mixed up and celebrated by Agave and Syalis. Emotions run high as the Demon King and hero run into each other—and the secret of Twilight’s first love is finally revealed (to him). There’s also Teddy Demon transformations, concerning commentary about confidential content, boisterous baking, vexing vacations, and more!
Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored.
The mysteries of the missing member of the Ten Guardians and the castle-wide gender swap are simultaneously solved. Bean-based holidays are mixed up and celebrated by Agave and Syalis. Emotions run high as the Demon King and hero run into each other—and the secret of Twilight’s first love is finally revealed (to him). There’s also Teddy Demon transformations, concerning commentary about confidential content, boisterous baking, vexing vacations, and more!