The stage is the high school days spent by Kaede and his best friend, Kazuha, who are about to enter Futatsubashi University. Kaede spends a moyamoya period when she goes out with Nina but she has indigestion and can't move on to her next love affair, while her feelings for her unforgettable ex-girlfriend, Mitsu, cannot be cut off. On the other hand, Kazuha has a good way to maintain a light relationship with girls. The two are contrasting on the inside, but they are strangely close friends. They had a favorite sauna where they talked to each other after school. There, the true intentions of men who were forbidden to girls were told.