The old wife and husband couple, Shuzo and Tomiko, has three children. The eldest son live along with his parents, their daughter lives with her husband in the neighborhood, and the youngest son is planning to get married to his girlfriend. This family has ordinary and happy lives, but unbelievable decision from their mother suddenly hits the family.

On the birthday of Tomiko, her husband, Shuzo, asks her what she wants as a memorial gift. She answers, “A divorce”.