Teenager Shiki is attacked by a mysterious man. As his foster father Tsuyoshi helps him flee, he learns of his surprising and legendary heritage.

Shiki wakes up confused in front of Naito, who explains the situation between the Oni and the Momotaro.

The first test the boys face to enter the academy is playing "demon catcher."

If they want to pass the test their teacher has given them, students must work together.

The students reach the Kyoto underground and discover new things about the war they are involved in.