From bestselling author Sherrilyn Kenyon and debut authors Hinako & Madaug Hishinuma comes a middle-grade fantasy adventure unlike any other, where demons rub shoulders with gods and one boy must learn to control his power before it's too late.

Banished, isolated, and hunted for a destiny he doesn't understand, Ryuichi must learn to master the powers he inherited from his mother in order to protect the sacred gates that separate the mortal world from the realm of demons. If he doesn't kami, yôkai, and demons who are bent on making mankind suffer will flood the human realm.

No one can be trusted. Not even his own guardian ... and here he thought puberty was the worst thing to threaten his sanity.

If he's going to survive, he has to figure out who his real allies are, and who wants him dead. He will have to become the Demon Shinobi and learn that sometimes things have to go wrong in order to go right. And that in order to overcome evil, sometimes you have to bend the rules and be more than you ever thought you could be-and believe in people others tell you not to trust.