Whenever Akane comes home, her neighbor Oda-kun, a university student who speaks in Tsugaru dialect and forgets his key, is always waiting for her. It happened at first by accident, when she felt sorry for him and let him stay over. But gradually, his stays became more frequent and his demands increased. "You like my muscles, don't you?" he asks, gesturing. In the face of these beautifully chiseled muscles, my adult reasoning could... barely endure (past tense). This mountain range of muscles by itself was overwhelming, but then Okada, whom I had thought of like a little brother, exclaimed: "I want to have sex with you." Okada-kun is cute and egoistic ("adorable, you fell for me so easily") and sexier than anyone else... that sort of Okada-kun it seems also has a secret...?