This manga tells the legacy of Mitsuyo Maeda a Brazilian naturalized as Otávio Maeda, who was a Japanese judōka (judo expert) and prizefighter in no holds barred competitions. He was also known as Count Combat or Conde Koma in Spanish and Portuguese, a nickname he picked up in Spain in 1908. Along with Antônio Soshihiro Satake (another naturalized Brazilian), he pioneered judo in Brazil, the United Kingdom, and other countries.

Maeda was fundamental to the development of Brazilian Jiu-Jitsu, including through his teaching of Carlos Gracie and others of the Gracie family. He was also a promoter of Japanese emigration to Brazil. Maeda won more than 2,000 professional fights in his career. His accomplishments led to him being called the "toughest man who ever lived" and being referred to as the father of Brazilian Jiu-jitsu.