Sumire used to date her good-for-nothing ex-boyfriend, Tsuyoshi. Tsuyoshi was a typical thug who would always ask for money, cheat on her, and didn't use birth control. After dating for many years, Sumire was finally able to escape from Tsuyoshi, and now she was living with her kind and proper boyfriend, Takao, with the intention of getting married. However, when Sumire saw Sumire with Takao, he tried to get on Sumire again.