Kurenai Sanshirō , known outside Japan as Judo Boy, is a Japanese anime television series created by Tatsuo Yoshida and his brother Ippei Kuri loosely based on the manga Judo Boy written by Yutaka Arai and Kuri and illustrated by Yoshida. The series aired on Fuji TV from April 2, 1969, to September 24, 1969, totaling 26 episodes. The series was also followed by two manga adaptations, the first written by Masato Tenma and illustrated by Kuri published in Shogakukan's Weekly Shōnen Sunday from July 28 to November 17, 1968, and a four-chapters series written by Yoshida and illustrated by Mamoru Uchiyama in Shueisha's Weekly Shōnen Jump from May 22 to July 10, 1969.