Yuya returns home for a long break from university. Kokoro begins to flutter again when he reunites with his mother's friend, Rin, whom he has secretly admired for a long time. That night, he is so nervous that he can't sleep after learning that she will be staying at his house, when a drunk Rin comes to his room... He can't resist her defenseless and aggressive behavior and they end up having a relationship. Yuya is excited by their secret, but Rin, who has been having trouble with her husband and has sex with him as a way of getting back at him, ends up worrying and thinking, "I can't go on like this..."