Ryo Hinomi is an IT specialist who often work from home. Ryo marries to a woman who has a daughter called Tsumugi-kun. Because of Tsumugi’s mom previous marriage, Tsumugi becomes a disrespectful woman, especially towards men. Ryo sometimes goes to his favorite cafe to work, the place where he mets Saki, Tsumugi’s bestfriend. Saki is an honor student at her school but she’s actually a lewd girl who hooks Ryo up and bring him to bed for money. Ryo wants to become a good stepdad to Tsumugi but he grows tired with Tsumugi’s behavior and has stopped perceive her as his stepdaughter. One day Saki sends him a nude photo of her. Ryo leaves his phone on the table purposely and lets Tsumugi to take the bait. He plans to punishes Tsumugi for all of her disrespectful behavior.