While fleeing with his adoptive father, Shiki Ichinose is attacked by an unknown assailant. He learns he's actually a descendant of the Oni, and a target of the Momotaro Agency.

Shiki wakes up confused in front of Oni Agency member Naito Mudano, who explains the situation with the Oni and the Momotaro.

To enter the academy, the boys must first pass a test: a game of demon catcher.

Shiki manages to trigger Blood Eclipse Release, bringing down the Blood Titan, but collapses after draining too much blood; Jin ignores the fallen Shiki and Homare, charging straight at Mudano.

Mudano takes the team on a trip to help the Kyoto base. The Momotaro Agency's Tsubakiri Momomiya and Yomogi Momokusa launched an attack on the Oni, leaving dozens of wounded. Mudano entrusts the students to Commander Oiranzaka, heading to battle.

The Oni bodies are seeded with Tsubakiri's bacteria. Reanimated by his power, the corpses turn on their former comrades. With the non-combat support staff and the wounded unable to fight back, the Kyoto base is pushed to the brink of collapse.