Chapters 1 and 3 focus on the new relationship between Shiba, a high
school student, and his teacher Onosaka. Things are not going well --
sensei has an inferiority complex because Shiba likes large-breasted
girls.
Chapters 2 and 4 are about Inuo (a friend of Shiba's,
who's quite the player with girls) and Natsuda, a boy with whom he finds
himself in a love hotel the morning after a wild party. Inuo would just
like to forget everything because he's definitely not gay, but Natsuda
wants to be his friend so badly that he can't turn him down. Natsuda
turns out to be a cheerful and engaging companion, and Inuo starts to
spend more and more time with him, going to movies and hanging out. But
when he finds himself embracing Natsuda again, he pushes him away --
because he's definitely not gay!
Chapter 5 introduces Shiba's
brother Keisuke and his friend Aki. Aki wants to do more than kiss, but
Keisuke only went along with the kissing because it was Aki who asked
him. So now that summer break has arrived he avoids Aki. But when Aki
stops calling and avoids him in turn, he's not happy at all.