Tsukioka has a hard time building a relationship because of his XL sized private part. One day, his classmate Tokieda sees his private part and suggests having sex. Tsukioka, who is worried about being too big, and Tokieda, who is faithful and greedy about what feels good, are a perfect match regarding compatibility and size! The two begin a limited-time friendship with benefits until they get girlfriends, but they gradually start to be attracted to each other's true nature...? (Source: Libre, translated)