Miki grew up in an ordinary household and had her first sexual experience during high school. In college, she was frequently invited by friends to join group parties, where she ended up sleeping with several men. Even after entering the workforce, she continued receiving invitations to drinking parties and eventually dated a man seriously for two years before marrying him. While she had no complaints about their daily life, she found herself passive during sex with her husband, which became a growing concern—she secretly hoped for gradual improvement.