The Ballad of Tobio

The Ballad of Tobio (トビオのバラード) is a manga series by Osamu Tezuka that ran on Weekly Shōnen Magazine from 1965 to 1969, it tells the story of 15-year old orphan Tobio Tenma (Expanding his brief role in Tezuka's Astro Boy, this time, in a different role) training from Street Smart Teen to Featherweight Prize fighter, this is considred to be Tezuka's most violent work in his career.

in 1975, United Artists released a loose adaptation simply named Toby, starring Gene Hackman as the trainer Robert Shmuel, in 1979, an Anime adaptation was aired on NTV that concluded in 1982, followed by some Video games.