Yuya returns home for a long vacation from university. His heart begins to stir once again as he reunites with his mother's friend Rin, whom he has secretly admired for a long time. That night, when he finds out that she will be staying at her house, he is having a sleepless night due to her nervousness, when a drunk Rin comes to her room... She couldn't stand his defenseless and aggressive behavior and got into a relationship with him. Yuya is excited about the secret between just the two of them, but he is worried about not getting along with his girlfriend's husband.