Koiko Kitamura continues to stay strong after losing her husband, insisting she is still full of energy. However, her son and daughter-in-law, with whom she lives, treat her like an old woman, leaving her secretly resentful. One day, she is forced to take care of her overly sheltered college-student grandson. As she gets dragged into his unpredictable behavior, she gradually adapts in her own unique way, navigating their complicated relationship.