Saiharu has been dating her current boyfriend for seven years. From the beginning of their relationship, her boyfriend's best friend, Yuta, was always by her side. Before they knew it, it had become normal for the three of them to be together. Saiharu had unconsciously begun to show a vulnerable side of herself in front of Yuta that she only shows to her boyfriend. However, for Yuta, who had been secretly in love with Saiharu for seven years, this was a cruel shock.