Kyouai no Hokenshitsu

Aomine Nana had been yearning for something to ruin her perfect self.
While helping out at the school infirmary, she meets Akashi Takuma, who's the complete opposite of her, and falls for him.
One day, while they're alone, he rapes her.
From then on, the five days of his obedience training begin.

[translated from DLsite]