Season 1

Yuuma is a young man who has just enrolled in university. At his welcome ceremony, he meets Nana, an older student from the same university, who shows great interest in him. That same night, when Yuuma returned to his apartment, he is surprised by Nana, who enters the place with the intention of taking his virginity.

After Yuuma loses his virginity to Nana, he feels guilty because he believes she has a boyfriend, yet he cannot resist the pleasure of sex. Now that Nana has gained a sexfriend, she takes Yuuma to a love hotel to explore new experiences.