On a weekday morning like any other, fourth grader Natsumi is on her way to school when she suddenly decides to run away from home. Leaving her school bag in a luggage locker, she heads for her grandmother's house, who lives far away. Her grandmother is surprised by her sudden visit, but she understands Natsumi's feelings and welcomes her warmly. Natsumi is exhausted from the stress of her parents' tumultuous relationship. She begins to find peace as she spends time with her grandmother and her neighbors, who seem to be enjoying themselves without a care in the world. But, the next day, her parents come looking to take her home…