Judo Boy(1969)

Sanshiro, a teenage martial artist, trains in the Kurenai School of Jiujitsu and searches for his father's killer. Accompanying Sanshiro is an orphaned boy named Kenbo and his pet dog Boke. Sanshiro's only clue to his father's murderer is a glass eye left on the scene of the crime, suggesting that his father's murderer was one-eyed.