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.

Having no luck in finding the Nostradamus Key, Bunmei meets Mikaze Nakagawa at the diner she works in. Meanwhile, people are mysteriously disappearing around the city.

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.