In 1999, Maya Kumashiro attends the funeral of her late father, the principal of Waldstein Academy when a recording left by him summons a demon that starts attacking the students, leaving her with no option but to confront it.

Mikaze is defeated, but Bunmei finds that the future is still unaltered and that his encounter with his younger self is the real Nostradamus Key. When he ends up activating the key, the alien invasion begins and Bunmei regains his lost powers to stand against it by himself.