Haruka, whose husband has been ignoring her, is drinking with her female friends at an izakaya. However, perhaps due to her drunkenness, she ends up getting involved with Shinji, a student who is drinking next to her... Feeling awkward, she doesn't contact him after that, but one day they run into each other on the street and end up having sex. Then, Shinji gives Haruka a spare key to his room, and before she knows it, she starts looking forward to using it to wait for him to come home. This is because she knows that when she gets home, she'll be having sex with the young and energetic man countless times...