The play tells the story of the protagonist Kano who is at home all day long, and he lives a boring life on the manga prize he used to get from the publishing house. One day, a 5-year-old child, Kotaro, suddenly moved next door to him. At first, Kano thought to himself, "Why does this kid live alone!?" "Huh? Could it be my child!? Since he didn't want to get into trouble, he avoided this lonely child everywhere in his life. But when he knew that Kotaro's adult-like words and deeds were hidden behind the sincere feeling of "wanting to become strong", he began to take care of Kotaro.