North Building Fire

It wasn't actually a fire, but someone trashing the girls' bathroom. Ever since this incident, Natsuno Minami stopped showing up at school.

The destruction of the north building girls' bathroom was the result of the battle between the Tomi Kisaragi android, who was after Minami, and Tamao Kurabe's android. This is also when the entity inside of the Kisaragi android and the Tamao android switched places.^[1]