Reina has always had feelings for a senior who lives in her neighborhood, and her love for him remains unwavering even now, and she joins the company where that senior works. However, one of her seniors ends up having a girlfriend... His girlfriend Reina, who has feelings that have nowhere to go, is consulted by her senior about having sex with her. ``...Then why don't you practice with me?'' For whatever reason, Reina feels the momentary joy of being able to interact closely with the person she likes, but... This is an erotic love story in which a secret practice brings two people closer together.