University student Takane is living a depressing life because he has been labeled as a manwhore, who makes moves on both men and women alike because of his good looks.
One day, at a welcome party for new students, he was fed up with a guy asking him out. Irritated, he brushes him away, only to witness the guy take a new student, Minami, into the restroom right after. He rushes after them and, as suspected, saves Minami from being assaulted. Minami says he will suck him off as a thank-you and forcefully takes Takane into his mouth, but he's so bad at it, Takane couldn't cum at all!
However, Minami is visually very much his type, and he is unable to resist his request to make him as a sex friend, so their physical relationship begins—!?

Volume 1: Karisome Bitch Minami-kun
Volume 2: Karisome Bitch Minami-kun ~ Tsuzuki no Hanashi ~
大学生の高根は、ルックスの良さから男女構わず手を出すヤリチン認定され憂鬱な日々を送っている。
その日も、新入生歓迎会で男から誘われうんざりしていた。
イラつきながら追い払うと、男の矛先が新入生の南に向きトイレに連れ込まれているところを目撃してしまう。
慌てて後を追い、案の定襲われている南をなりゆきで助けると、
お礼に抜くと言い出し強引に咥えられ――たが、下手くそ！　全然抜けない！
しかしビジュアルは抜群に好みで「セフレにしてほしい」と迫る南に抗えず、体だけの関係が始まり――!?