After losing her husband, Chihiro supported herself and raised her only son, Wataru, by working part-time. Meals were always pre-made bento boxes, and she had no proper rest, feeling guilty towards Wataru. One day, as the Golden Week approached, Chihiro decided to take a long break and go to an amusement park with Wataru... On the first day of the holiday, Wataru couldn't hide his joy at his mother's home-cooked meal. Everything was supposed to go smoothly during this extended holiday... But just as happiness seemed to be reaching its peak, Chihiro's cell phone suddenly rang...
