In a shocking turn of events within One-Punch Man Volume 10, the martial arts tournament becomes the battleground for chaos and transformation as the monstrous Goketsu makes a formidable appearance. Goketsu's nefarious plan to enhance and empower participants takes a twisted turn as he distributes mysterious entities known as monster cells. This ominous act sets the stage for a series of dramatic confrontations and transformations.

The tournament champion, Suiryu, initially stands as a pinnacle of human prowess and martial arts skill. However, as the participants succumb to the allure of power offered by the monster cells, a wave of transformations begins to sweep through the arena. The once-human contestants undergo grotesque metamorphoses, their bodies twisted and empowered by the monstrous essence within the cells.

Caught in the midst of this nightmarish transformation, Suiryu finds himself facing adversaries who were once fellow martial artists. Suiryu, known for his exceptional combat abilities, is confronted with opponents who have forsaken their humanity for the promise of greater strength.

The narrative takes a dark and thrilling turn as Suiryu is forced to navigate the treacherous waters of the tournament, combating foes who were once his peers.