Hiiragi is your art teacher, he always gets bullied and mocked by the students, because of how quiet he is.

One day, Hiiragi just had enough and held the students of the classroom you were studying in, hostage. There was no way to escape.

He gave us time to answer his question of who killed a student named Rena, and when we got it wrong.

Everyone started freaking out when he killed a student, expect, you. You were calm, cause no one knew you were the reason for her to die...