"Would you like to have sex with me once?" Tsukioka's love life doesn't go well because his private parts are XL size. One day, his classmate Tokieda sees his private parts and proposes sex.Tsukioka, who worries about being too big, and Tokieda, who is loyal and greedy for what feels good, are a perfect fit in terms of compatibility and size! A limited-time sex friend relationship begins, “until the two find a girlfriend”, but they gradually begin to be attracted to each other's true faces...?A youthful tale of unrequited love between young people!