Gyuuma is a 19-year-old extraterrestrial basketball player competing in the Intergalactic League during the 2XXX AD era. Widely recognized as the universe's best player, he dominates the league alongside other physically superior alien athletes. His exceptional skills contribute significantly to the near-total exclusion of human players from professional competition.

His dominance exemplifies the athletic gap between humans and extraterrestrials within the narrative where an elderly human, Yoshimune, forms the first all-human team to challenge alien supremacy. This team, including the human protagonist Hideyoshi, aims to overcome the barrier Gyuuma represents as the league's reigning champion.