Heisuke is a young man tasked with looking after his younger cousin, Aki, for a single day. Aki, an only child accustomed to staying home alone, is quiet and reserved, often going out of his way to avoid causing trouble for others. As they spend time together, Aki becomes increasingly attached to Heisuke, particularly because Heisuke enjoys making sweets and desserts. Eventually, the quiet Aki opens up to Heisuke, who in turn teaches him that it is sometimes acceptable to be selfish and express what one truly wants to do.