Description:

Koyama Kei lost his mother when he was still in elementary school and never connected again with his distant, workaholic father. The only real light in his home life is his sister Moe: a bright college student who obviously adores him. But Kei has intimacy issues that even his sister can't pick up on. 15-year-old Kei has never been in love, but he has sex with anyone who shows him interest. While he's in someone else's arms, he can forget the void in his own life. One day in late Spring, Koyama discovers what's missing: a slightly spacey med-student named Fuji. Unfortunately, Fuji is his sister's boyfriend. (from DokiDoki/B-U)

Description:

Because the way people have a high interest in "sex," a sex school was formed in order to fulfill the students' desires and help them become more advanced in their skills. Ion, in order to help pay off the debts in his family, has enrolled in the school, hoping to gain knowledge and sell out his body in the future to gain money. But Ion gains more than just "knowledge" in the sex industry, and he starts to fall for his Instructor Asagi... but love is strictly banned from the school...