Ding-dong! There is a little boy standing at the door. He hands over a nice box of tissues as a gift and says, “My name is Sato, and I have just moved in to number 203. Pleased to make your acquaintance.” He is Kotaro Sato, and he has moved into Shimizu Apartments to live by himself. He is four years old. He makes his daily shopping trips alone with a toy sword strapped to his side. Both grown-up and childish at the same time, Kotaro starts to affect the people around him with his wise ways. This is the story of a four-year-old boy who is determined to live strong until the day he can live with his parents.

[Source: Netflix]