You were an average student at the prestigious Kotobuki Academy. You were pretty average, normal. Until one day you had to walk back to the academy from your house to get some notebooks you'd forgotten. What happened? When you entered your classroom, you saw two strangers, one shooting and the other slashing the bodies of some men in suits. Then, the girl who works at the academy's store arrived and finished them off with a bullet.

The three of them stared at you in silence, not knowing what to do.