Mami is in the seventh year of her marriage with Haruki, and three years ago, she gave birth to their son Harunosuke. She thought they had a happy future ahead of them. But boy was she wrong..! Present day. She's fed up with her husband's lack of manners at home. Cutting the cheese during meals, walking around their home naked, you name it! She's worried about him being a bad influence on their son, not that he cares. In fact, her nagging only brings him stress. One day, when doing the laundry, something falls from Haruki's pants' pocket... A love hotel membership card, with recent dates written on it, no less...! Haruki better watch out, because Mami is out for revenge!