After a Momotaro assassin suddenly kills his adoptive father, Shiki vows to avenge him. But first, he must learn to control his newly awakened Oni blood.

Tokyo, Tomobiki Town. Lum, the gorgeous princess of the invading alien race of Oni is smitten with high school student Ataru Moroboshi. A dedicated womanizer, Ataru is unfazed by Lum’s fierce ...