Kono Ko Dare no Ko?.

A unique school drama about a girl who was raped by another man and became pregnant despite having a boyfriend. After transferring, Takuya joined the judo club. Takuya had a crush on Aoi, and joined the club desperately in the hopes of becoming closer to her. Takuya knew that Aoi had a boyfriend but he still wanted Aoi to be his. After failing at the judo club, Takuya suddenly changes his attitude and forcefully pushes Aoi causing her to lose consciousness. Seeing her unconscious, Takuya's romantic feelings for Aoi exploded, and he rapes her. After being raped by Takuya, Aoi becomes pregnant with Takuya's child. Aoi decides to give birth alone and runs away from home. Shindo Sojiro searches for Aoi, intensely hating Takuya, who ruined their romance and raped his girlfriend. Takuya takes responsibility for the rape and voluntarily drops out of high school. He attempt to forget Aoi but then changes his mind and sets out to find her. And the story reaches a shocking conclusion....