Katsumi and Minoru are childhood friends and best friends. They are the center of attention at their high school and are rumored to be “dating” because they hang out at all hours of the day and have excessive skinship.

In fact, Katsumi has a secret romantic interest in Minoru. It is clear that Minoru has a special fondness for Katsumi, but Katsumi is aware that it is a mixture of familial love, friendship, and sexual desire, which is definitely different from love, and he tries desperately to restrain himself from crossing the line of being best friends.

However, the dangerous equilibrium is suddenly upset one day...?