As he awakens from a dream, Mitsui Tenma transmigrates in the flesh. The bullet-screen System he carries with him watches his life like an anime.
A search of the dark little room turns up no clues to his identity. Outside the front door, a trash bag contains a school uniform soaked in blood. The culprit is Tokisaki Kurumi, who lives next door.
In neighboring Morioh, an Italian gang has barged in and started a shootout.
In the hot spring city of Fuyuki, Servants appear in the world of the living.
One day, on the way to class, an entire class is pulled into a game run by the Main God.
During a visit to Kuoh Academy, he witnesses demons and Shinigami fighting over territory.
As the bullet-screen comments watch, Mitsui Tenma, both protagonist and performer, has no choice but to get involved in all sorts of trouble.
Little by little, he becomes a savior.
