Akane returns home, Okada-kun, a student at Tsugaru Ben University next door, who forgot her key, is always waiting for Akane. The beginning of the matter was a coincidence, and if you feel sorry for him at first, the frequency of staying will gradually increase, and Okada-kun's demands will escalate! "You like my muscles, don't you?" in front of beautiful sculpture-grade muscles, but still endured with adult reason ... I wanted (past tense). Even though his mountain range-class muscles alone are overcapable, Okada-kun, who thought he was like a younger brother, declared, "I really want to have sex"! ?? "Wow, it's so easy to fall off" Selfish, cute, but more erotic than anyone else ... It seems that Okada-kun also has "a secret" ...?