Jugo Sango enters Misaki Shogyo High School as a novice, drawn to the judo team when senior members recruit for strong judoka despite the team's weak standing. Previously focused only on musical instruments, he possesses no prior judo experience. Sango endures the seniors' demanding training regimen, refusing to quit through the challenges. This persistence leads him to develop skill in the seoi-nage technique, which becomes his favored throw. His name, "Sango Jugo," incorporates a numerical pun: "sango" (三五) meaning three and five, and "jugo" (十五) meaning fifteen, reflecting that three multiplied by five equals fifteen.