Kasumi, who lives a newlywed life with her beloved husband, moved to a new house and was only thinking about a happy future. - One day, she temporarily hides her husband's younger brother (scum human) "Masaki". Kasumi naturally hated Masaki's things, but her husband told her that she couldn't leave him alone because he was the only immediate family, so she had no choice but to live with him. A few days later, after her husband's business trip began, Masaki occupied her home with her own face and repeated the words and actions that Kasumi disgusted. When Kasumi reprimands him for it...