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.
If even one of you falls, you'll have 
to start from the beginning.
إن سقط أيّ منكم، عليكم أن تبدؤوا من البداية
Wenn nur ein Einziger versagt,
Si alguno se cae,
tendrán que empezar de nuevo.
Si alguno se cae,
tendréis que empezar de nuevo.
si l’un de vous cède,
vous devrez tout recommencer.
se anche uno solo crollasse,
Se algum de vocês cair, todos
vocês começarão do começo.
Если хоть один из вас упадёт, 
все начнут с начала.