Book 1

In/Spectre 1

by Kyou Shirodaira and Chasiba Katase

Published 22 November 2016
KINDRED SPIRITS 
 
The 17-year-old Kotoko has a unique situation. When she was a child, she was kidnapped by spirits called yōkai, and returned missing one leg and one eye. Since then, she has been able to communicate with otherworldly forces, both benevolent and dangerous. Kotoko is alone in her power until she learns that the crush she's watched from afar, Kurō, has had his own encounter with yōkai! As if being touched by the supernatural wasn't enough, Kurō's personal life is also in shambles. With their shared experiences and understanding, Kotoko and Kurō form a partnership to deal with mysteries, from ancient demons to the ghost of an idol. But for a girl who's used to dealing with spirits, winning love might prove to be the bigger challenge!

Book 2

In/Spectre 2

by Kyou Shirodaira and Chasiba Katase

Published 10 January 2017
EX FACTOR

Kotoko investigates the mysterious death of former idol Karin Nanase, who now terrorizes the sleepy town of Makurazaka as “Steel Lady Nanase.” But with Kurō missing and the threat of the Steel Lady potentially causing harm to the Makurazaka’s citizens, Kotoko is left with no choice but to team-up with Kurō’s ex-girlfriend, Saki. And later, as the Steel Lady strikes again, the origins of Kuro’s bizarre powers are revealed.

Book 3

In/Spectre 3

by Kyou Shirodaira and Chasiba Katase

Published 21 March 2017
The new mystery thriller with a romantic edge from the creator of Blast of Tempest, and The Record of a Fallen Vampire! 

FALSE IDOL

The uneasy trio of Kotoko, Kurô, and Saki are facing a seemingly impossible challenge in trying to stop the terror of “Steel Lady Nanase,” the ghost of a dead idol. How can you kill something that won’t die even if its neck is broken? The mystery is further complicated when internet rumors appear to be linked to the ghost’s origin. Now, Kotoko and Kurô must figure out how to defeat a figment of the imagination! To fight a story with another story, they’ll have to pool their resources and Saki’s connections to create something convincing. And is there a mastermind behind this phenomenon, or will some questions remain unanswered?

Book 4

In/Spectre 4

by Kyou Shirodaira and Chasiba Katase

Published 9 May 2017
STRANGER THAN FICTION

Whether or not the spectre of a dead idol is real, the urban legend of “Steel Lady Nanase” feeds people’s imaginations and results in a murder that hits close to home for Saki. This brutal death causes the legend to further balloon out of control, and Kotoko and Kurô must devise a lie that can counteract the belief that such a dangerous ghost even exists. But matters become complicated when the group discovers that the person behind the myth may be someone Kurô has known all along…What powers can bring a ghost to life, and what motivated this trickery?

Book 5

In/Spectre 5

by Kyou Shirodaira and Chasiba Katase

Published 18 July 2017
TRUTH TO POWER

With the violence and the urban legend of Steel Lady Nanase only continuing to grow in power, it's up to Kotoko to put a stop to her once and for all—and quickly! Her mission is complicated by the likelihood that Kurô's sickly cousin, Rikka, is the mastermind behind it all. Kotoko gathers "four solutions" to destroy the truth that Rikka has brought to life, but can a lie destroy a fictional monster and create a new truth? Armed only with these imaginative solutions, Kotoko, Kurô, and Saki kick off the decisive battle with Steel Lady Nanase.

Book 6

In/Spectre 6

by Kyou Shirodaira and Chasiba Katase

Published 26 September 2017
INDUCTIVE REASONING

“Steel Lady Nanase”—the urban legend of a faceless, bloodthirsty phantom who had once been a voluptuous idol— as gone from myth to terrifying reality thanks to Rikka’s powers. In order to defeat this fictitious monster, Kotoko continues to present her “four solutions” to create a new “truth,” as Kurô uses his abilities to defeat the spectre once and for all. With two solutions rejected and only two remaining, canKotoko’s invented inference put the myth of the Steel Lady to rest once and for all, or is the fate of her and Kurô’s futures completely out of her hands?

Book 7

In/Spectre 7

by Kyou Shirodaira and Chasiba Katase

Published 10 April 2018
The new mystery thriller with a romantic edge from the creator of Blast of Tempest, and The Record of a Fallen Vampire! 

Both touched by spirits called yokai, Kotoko and Kuro have gained unique superhuman powers. But to gain her powers Kotoko has given up an eye and a leg, and Kuro's personal life is in shambles. So when Kotoko suggests they team up to deal with renegades from the spirit world, Kuro doesn't have many other choices, but Kotoko might just have a few ulterior motives...

Book 8

In/Spectre 8

by Kyou Shirodaira and Chasiba Katase

Published 14 August 2018
A fantasy/mystery series with a unique Japanese flavor perfect for fans of Noragami: Stray God and Tokyo Ghoul.

Ages 13+


WHEN YOU WISH UPON A STAR

Totomizu was a flourishing little seaside tourist town until suddenly, thousands of dead fish started washing up on shore. No one knows what's causing it--no one, that is, but the spectres. They say a strange wooden doll is behind this unnatural phenomenon. Can Kotoko solve the mystery and save the town?

Book 9

In/Spectre 9

by Kyou Shirodaira and Chasiba Katase

Published 26 February 2019
A fantasy/mystery series with a unique Japanese flavor perfect for fans of Noragami: Stray God and Tokyo Ghoul.

Ages 13+


A BATTLE OF WITS

Even the mysterious Kotoko Iwanaga was a high school student once, but could a girl like her ever fit in with regular teenagers? There is one student who thinks she would be a great addition to his club, but can he possibly convince the lone wolf to become a member of an organization? Learn how Manabu Amachi manipulated Kotoko into joining the mystery appreciation club!

Book 10

In/Spectre 10

by Kyou Shirodaira and Chasiba Katase

Published 22 October 2019
A fantasy/mystery series with a unique Japanese flavor perfect for fans of Noragami: Stray God and Tokyo Ghoul.

Ages 13+


RIKKA RETURNS

It's been nearly a year, and Kotoko has yet to find Rikka Sakuragawa. Little does she know that Rikka has recently moved into a nice little apartment that came at a very affordable price...because it's thought to be cursed! What is causing the series of suicides in her new home? And can Kotoko catch her before she goes on the run again?

Book 11

In/Spectre 11

by Kyou Shirodaira and Chasiba Katase

Published 25 February 2020
A fantasy/mystery series with a unique Japanese flavor perfect for fans of Noragami: Stray God and Tokyo Ghoul.

Ages 13+


A SUPERNATURAL COLD CASE

Twenty-three years ago, Sumi Otonashi was killed in a mugging gone wrong. Or was she? Out of nowhere, her husband Gôichi reveals to his heirs that he killed her--and challenges them to figure out how. But can they reach a plausible explanation without knowing he contracted a spectre to do the deed? And what will their own buried secrets bring to light? Kotoko will have to judge the heirs' solutions, and lead them to the right answer...

Book 12

In/Spectre 12

by Kyou Shirodaira and Chasiba Katase

Published 25 August 2020
A fantasy/mystery series with a unique Japanese flavor perfect for fans of Noragami: Stray God and Tokyo Ghoul.

Ages 16+


ANY LAST WORDS?

As Rikka continues her solitary journey, she makes the acquaintance of one of Kotoko's high school friends, who reminisces fondly of their days in the Mystery Appreciation Club theorizing about dying messages. Meanwhile, a snow demoness has a request for Kotoko, hoping the revered Goddess of Wisdom can find a way to exonerate her human friend of some very serious charges...

Book 13

In/Spectre 13

by Chasiba Katase

Published 23 March 2021
Both touched by spirits called yokai, Kotoko and Kuro have gained unique superhuman powers. But to gain her powers Kotoko has given up an eye and a leg, and Kuro's personal life is in shambles. So when Kotoko suggests they team up to deal with renegades from the spirit world, Kuro doesn't have many other choices, but Kotoko might just have a few ulterior motives...