Book 1

Demon Sacred

by Natsumi Itsuki

Published 12 October 2010
There is a sickness, named the Return Syndrome, that causes people to physically regress toward infancy until they simply disappear. If someone you loved became afflicted with it, would you give up? No! You'd do anything humanly possible to help them. You'd find a way to get someone inside the leading corporation researching a cure-the same company that seems suspiciously unwilling to share any knowledge it possesses about the sickness, even with its own workers. You might even reach beyond human means to help them. And when the inhuman comes in such gorgeous packaging, it might be hard to resist! Join Mona, K2, Rina, Mika and Shinobu as they fight against the Return Syndrome, dark company secrets, and enemies (both human and inhuman). There may even be a dragonslayer in the mix!

Book 2

Demon Sacred

by Natsumi Itsuki

Published 12 October 2010
Mona finds out that one of her best friend's father has died of Return Syndrome. But while visiting her friend to console her, she is attacked by a bunch of thugs! K2 jumps in, but Mona stops him on the grounds that she doesn't like violence. Meanwhile, Mikka meets another high-level demon, Griffin, and narrowly escapes being consumed by him!

Book 3

Demon Sacred

by Natsumi Itsuki

Published 7 December 2010
In this gorgeous, shojo fantasy, the virus that sends its victims back into their childhoods continues to spreads, and our four heroes team up to find the cure.

Book 4

Demon Sacred

by Natsumi Itsuki

Published 1 March 2011
A wicked virus sends people back to their childhoods, and our four heroes are determined to find the cure! Secrets behind K2's birth are revealed along with his relation to Red Dragon, and Helmet begins taking action while Rina's feelings of love awaken.

Book 5

Demon Sacred

by Natsumi Itsuki

Published 14 June 2011
The fun, fast-paced fantasy continues, with lots of inventive plot twists, in this next volume of the shojo adventure "Demon Sacred".