One day, Misa, a nursery teacher, happens to meet Kato, the father of a boy in her class. Kato was an affair partner that Misa met at a part-time job during her junior college days. The love was supposed to be over, but from that day on, something inside Misa began to crumble. One night, Misa called Kato's number, which was left on her cellphone. A bare story.