I'm tempted by my girlfriend's too cute female friend who absolutely can't get my hands on me and I'm crazy about cheating sex! Masami, who is living with her, had to leave her room for a week trip and was supposed to be alone for the first time in a long time. However, her friend Yuuki, who came to the drinking party she held before her departure, suddenly approached her when she was drunk and slept. And after she went on a trip, for a week until she came back with Yuuki who came to play again, a cohabitation life began every day.
