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Heisuke is responsible for looking after his younger cousin Aki for a day. Aki, an only child who often stays home alone, is shy and avoids causing any trouble. As the two spend time together, Aki becomes increasingly attached to Heisuke, who enjoys making sweets and desserts. Over time, Aki starts to open up, and Heisuke helps him understand that it is acceptable to express his true desires and be a bit selfish at times.