The play tells the story of the protagonist Kano who stays at home all day and lives a boring life relying on the comic bonus he received from the publisher. One day, a 5-year-old child named Kotaro suddenly moved in next door. At first, Kano thought to himself: "Why does this child live alone!?" "Ah? Is it my child!?" Because he didn't want to be involved in trouble, he avoided this child who lived alone in his life. But when he learned that Kotaro's adult-like words and deeds were hidden behind his sincere desire to "become strong", he began to take care of Kotaro.