Tatsuya used his summer vacation to visit his aunt Ria's house. Tatsuya has admired the kind and beautiful Ria since he was a child, but now that he has grown up, that feeling has changed to that of an adult man towards a woman. But her aunt has a husband. Tatsuya is helpless and filled with frustration... Knowing or not knowing Tatsuya's feelings, Ria makes an unexpected proposal. "Shall we take a bath together like we used to?"
