Mizuki begins cohabiting with her son and his new wife. However, the daughter-in-law's behavior is childish and disrespectful, repeatedly provoking Mizuki's anger. Her kind and considerate son struggles alone, trying to manage both housework and his job. One day, the wife suddenly erupts in rage, leaving the son increasingly distressed. Just then, Mizuki happens to pass by—upon seeing her, the wife quickly disappears. Mizuki gently comforts her son, firmly embracing him and declaring she'll handle all the housework from now on. A few days later, the son submits divorce papers to his wife and starts a new life together with Mizuki.