Misao (Ai Mikami) cannot resist her desire for Ichikawa (Taiki Sato), despite knowing that he is with Tadokoro (Umika Kawashima). However, when Misao hears that the two are engaged, she is shocked to the core. Even so, Misao continues a physical relationship with him. Meanwhile, Ichikawa's feelings for Misao grow stronger day by day, but Tadokoro finds out that Ichikawa is having an affair with Misao. Ichikawa asks for a break-up, but Tadokoro refuses to let him go. Then, a few days later, Ichikawa receives a phone call from Tadokoro.