Tokiko Enomoto finds out that her husband Kazuya, who mostly lives at an apartment near his work while she and their children live at home, has been having an affair with a live-in mistress, Ryōko, at his apartment. Tokiko tells her two sons, Tarō and Jirō, that she has decided to divorce their father. The children are shocked but understand their mother's position. Kazuya realizes the damage he has done and tries to remedy the situation.

インタビュアーの仕事をこなし、中学生と小学生のふたりの息子と暮らしている榎本登起子。単身赴任中の夫から愛人がいることを告げられる。やがて、離婚を決意し、そのことを子どもたちにも伝える。子どもたちも登起子の気持ちを理解し登起子をバックアップしていく。