Sumire was dating her bastard ex-boyfriend Tsuyoshi. Tsuyoshi was a typical thug who was quick to make money, cheated on people, and didn't use birth control. Sumire, who was finally able to escape from Tsuyoshi after dating her girlfriend for many years, is now living with Takao, a proper and kind boyfriend, with the intention of getting married. However, Tsuyoshi, who witnessed Sumire with Takao, asks Sumire again.