This continues the story beyond season 2 of the original series and adapts chapters 108–136 of the original manga.

The story centers on the series' protagonist Nasa, who is asked by his junior high teacher to hold a class in an all-girls high school. The students end up seeking Nasa's advice about their love problems. On the other hand, Tsukasa pretends to be cool, but is actually nervous knowing that Nasa is surrounded by young high school girls.