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.
I'm a boy, so I'll protect you, Sis.
أنا صبيّ، لذا سأحميك يا أختي
Ich bin ein Junge,
darum werde ich dich beschützen.
Soy un hombre, yo te protegeré.
Soy un hombre, yo te protegeré.
Je suis un garçon,
alors je te protégerai !
Dato che sono un maschio,
io ti proteggerò, sorellona!
Eu sou homem, então eu
vou protegê-la, onee-chan.
Я мужчина, я тебя защищу!