When an unpopular manga artist has to care for his new neighbor, a 5-year-old child living alone, he learns the importance of responsibility and care as an adult.

Shin Karino is an unpopular manga artist who spends his days meaningless in his apartment. One day, he meets his new neighbor, Kotaro Sato, a 5-year-old child who will be living alone. Shin begins to take care of Kotaro and learns the importance of responsibility and care as an adult.