Sumire was dating a bastard ex-boyfriend Tsuyoshi. Tsuyoshi was a typical thug who quickly made money, had an affair, and did not use contraception. Sumire, who was able to escape from Tsuyoshi after dating for many years, now lives with her decent and gentle boyfriend Takao on the premise of marriage. However, Tsuyoshi, who witnessed Sumire being with Takao, was about to be Taka again.