Kasumi, who lives a newlywed life with her beloved husband, moved to a new house and was thinking only about a happy future. One day, she temporarily hides her husband's younger brother (Kuzu human) "Masaki". Kasumi naturally hated Masaki's things, but her husband told her that she couldn't leave her alone because she was the only relative. A few days later, after her husband's business trip began, Masaki occupies his home with his own face, and Kasumi repeats his disgusting words and deeds. When Kasumi rebukes it ...