From Wikipedia:
A lively boy named Daizaemon in traditional Japanese clothing comes with various kinds of animals to the capital of Tokyo. He has a funny habit of dancing whenever he hears music. He visits a friend of his late father's to learn judo and makes friends with the young daughter of the judo master Kikuko and the cat Nyanko-sensei. For a little girl, Kikuko has wonderful judo tricks inherited from her father while Nyanko-sensei is able to perform a difficult trick of triple turn in the air. Both of them are worthy instructors for Daizaemon. Although he shows clownish behavior once in a while, he is always popular among people around and grows stout and shrewd to be a future champion.

Won the 14th Shogakukan Manga Award in 1968 along with Animal 1.