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Heisuke, a high school student, finds himself responsible for looking after his young cousin Aki for a day. Aki is a quiet and reserved only child, accustomed to solitude and determined never to be a burden to anyone.

As they spend time together, Aki becomes deeply attached to Heisuke, especially drawn to his hobby of making sweets and desserts. Through their growing bond, the once-closed-off Aki begins to open up, and Heisuke gently guides him toward understanding that it's sometimes okay to be a little selfish and express one's true desires.

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