Yui Shimazaki, a 21-year-old kindergarten teacher who loves the piano and plays with children every day. Why does she voluntarily want to appear in an AV with her innocent young face and bright smile? ?? I can't be satisfied with my private life ... I like sex, but I can't tell my boyfriend a metamorphosis desire ... In order to satisfy that desire, I will do a second job, an AV actress, secretly at work.