In order to repay the debts of her beloved husband, Mariko requests a loan from her former classmate Anzai who has become a successful entrepreneur. In return, she agrees to live with him for three months. She learns of his loneliness, and her attraction to him grows.

Through a coincidence Tozaki runs into Kurata, his first crush from high school. They begin a relationship, but Kurata's jealousy starts causing problems.