The series starts after the Dream Choujin Tag Arc from the first series, ignoring the anime only Psycho and Goku'aku Choujin Arcs, and covers only the Survivor Match for the Kinniku Throne Arc. Additionally, the characters Detective Gobugari and Kinkotsu-Obaba do not appear in this series, and only Kinnikuman and Meat have their same voice actors from the first series. (Source: Kinnikuman Wiki)