Mother's best friend

Chinami, who works as a nurse, is seduced by her husband Masahiro, who is currently hospitalized, and gets married. However, Masahiro was sloppy and had been together for a while, and after a while the cheating bugs began to tingle and play with women. Masahiro has a stepchild named Tatsuya, who was born with his ex-wife, and lives with him. While Tatsuya, a high school student, dislikes her father who keeps cheating on her, she is worried about the kind-hearted Chineseami. One day, Tatsuya sees Chinami bravely waiting for Masahiro, who will not be home until late at night, and sees her lonely appearance...