Taro, a mongrel dog picked up by Kotaro, a freeter who is sloppy in everything. However, Kotaro's mother objects, saying that Kotaro, who can't take care of himself, can't keep a dog. In the end, Taro, who was placed in the Kotaro family for the time being without being officially recognized, decided to follow up on Kotaro's sloppiness so that he would never return to the life of a stray dog ​​again.