Sumire is dating Yosuke on the premise of marriage. She asks Yosuke to introduce her to her father, and when she goes to her house, she finds her former partner in Papa Katsu. Sumire, who was suggested by her father that the three of them should live together, accepts it because she is worried that if she hurts her mood, she will be exposed to her father's activities. One day when she started living with her, Yosuke got an urgent job and Sumire and her father were alone.
