Ever since her husband died in an accident, Arika has been living alone with her son Jun. Thanks to all her hard work in raising him, Jun got a job at a top company, got married, and was living a happy life... or so she thought. Since getting married, her wife Alice has spent her days playing around and barely doing any housework. Then, one day, Arika comes home to find that she's invited a male friend over for a drinking party! Having had enough, Arika scolds Alice, but Alice holds a grudge against Arika and conspires with her male friend to come up with a plan...