Despite her gyaru looks, Aihara Yuzu is an innocent high school girl with no experience and no prior loves. When her mother remarries, she's transferred into the prestigious "Aihara Academy" for young ladies. However, on her first day at school she happens to witness the diligent student council president, Aihara Mei, making out with her hot homeroom teacher... Yuzu returns home, unable to hid how upset it left her, when her mother announces Mei will be her new step sister, and they'll be sharing a room...?!
Huh? But you said you did him the other day!
Was? Neulich hast du doch noch gesagt,
ihr hättet’s getan.
Pero hace nada nos contaste
que hacían cosas pervertidas.
Pero si hace nada presumías
de hacer cochinadas con él.
Mais vous aviez pas baisé,
l’autre jour ?
Ma se qualche tempo fa 
hai detto di essertelo fatto!
Hã? Mas você transou com ele esses dias!
А говорила, ты переспала с ним недавно!