There used to be a family of four living in a certain housing complex. On a certain morning in the early summer just before everybody takes summer break, encouraged by her mother, Yuuna prepares box lunch for her family for the first time in her life. She challenges to make rolled omelet. During breakfast, the mother asks the father for a favor but the conversation leads to the discussion about the financial situation that concerns the future of their daughters. Their opinions conflict and the conversation escalates into a big argument. Meanwhile, Yuuna encourages herself to take a certain action.