College student Suwa is a trashy guy who's "only interested in sex." This is why he was dramatically dumped by his girlfriend, and when he meets Nagamine at the same school, he immediately starts aiming for him. He somehow ends up asking him, "it'd be great if we could do it in a casual way, like saying 'let's play basketball'," and the reply he gets is "then let's play basketball." Going with the flow of things, they do it and begin a sex-friends relationship. When Nagamine, who isn't comfortable with anyone, gradually begins to open up, Suwa feels happy. But he actually has other sex-friends......!?