After her mother and father died, Shiori and her little brother Shu were taken in by their uncle. Soon after, Shu was hospitalized with a hereditary disease, and Shiori was sent to the school as punishment for fighting back against her uncle's abuse. Meanwhile, Hibiki has taken over leadership of class four, and Hyo appears before him, to make him an offer he cannot refuse.
What happened yesterday 
was my responsibility,
،أنا المسؤول عمّا حدث البارحة
Was gestern geschah,
liegt in meiner Verantwortung,
Lo que pasó ayer fue cosa mía.
Lo que pasó ayer fue cosa mía.
Le raffut d’hier est ma faute.
J’ai défié le groupe des filles.
Gli avvenimenti di ieri sono mia responsabilità.
O que aconteceu ontem foi
minha responsabilidade,
За случившееся вчера отвечаю я,