薫は職場の同僚だった一郎と熟年結婚をした。一郎には引きこもりの一人息子・半造がいて、再婚の背景には、半造の世話役を求めていた。その思惑通り、半造は薫を本当の母親と思い甘えて暮らしていた。ある日、半造が「兄弟が欲しい」と薫に懇願するようになる。薫が閉経間近であることを知った半造は、強い焦燥に囚われ、ついに自らが薫を妊娠させようと行動にでてしまう…。

Kaoru married Ichiro, a colleague from work, in their later years. Ichiro had a reclusive son, Hanzo, and his reason for remarrying was to find someone to take care of Hanzo. As expected, Hanzo came to believe Kaoru was his real mother and lived a life of comfort and affection. One day, Hanzo began to beg Kaoru to give him a sibling. When Hanzo learned that Kaoru was nearing menopause, he became consumed with anxiety and finally took action to try and get Kaoru pregnant himself…