Story
Shiki Ichinose would have never guessed his adoptive father used to be an Oni-hunting Momotarou, much less that the old man walked away from that life just to raise him despite Shiki's dangerous Oni blood. After seeing the only parent he ever knew murdered by a Momotarou assassin, Shiki's blood awakens. Thrust into an ancient conflict between Oni and Momotarou, Shiki will fight to survive, to take his revenge--and to hold back the calamity coursing through his veins...

Source: Kodansha America

Synopsis
Ichinose Shiki, an inheritor of the blood of Oni, has lived out his life without being aware of his background until an unknown man comes rushing into his home in attempts to assassinate him, his foster father is forced to finally reveal the truth. After a deadly battle with Samidare Momoya, a Momotarou, leaves him without a father he joins Naito Mudano at Rakshasa Academy, a school for Oni to hone their abilities, in order to exact revenge for his foster father.