Nikusuke Doguro, once a celebrated athlete with a history of competitive triumphs, underwent a drastic physical decline into obesity. Now teaching at a girls' school, his position hangs by a thread under Tomomi’s blackmail, which she wields to manipulate him into aiding her schemes. With scarce job alternatives, he begrudgingly collaborates in her exploitation of students, masked as “specialized training” initiatives.

He channels innate sadistic tendencies through systematic student abuse, weaponizing his authority to fulfill external pressures and internal cravings. His imposing physique—marked by green hair, black eyes, and a hulking frame—serves as a stark contrast to his former athleticism.

When Madoka uncovers the school’s clandestine “Gymnastics of Darkness,” Nikusuke orchestrates her kidnapping. Later, he spearheads coordinated torture sessions against Tomomi himself, rallying others to inflict extreme brutality. These acts cement his role as a key enforcer within oppressive power dynamics, blending coercion, self-preservation, and personal gratification.