Mai Zenin, younger twin to Maki Zenin, endured systemic mistreatment within the prestigious Zenin clan due to their gender and the superstition deeming twins an ill omen. While Maki rebelled, Mai resigned herself to a subservient role, choosing mundane chores over sorcery’s violence. Maki’s abrupt departure shattered this uneasy compromise, compelling Mai’s enrollment at Kyoto Jujutsu High as a Grade 3 sorcerer—a role she resented, blaming her sister for imposing a path she never sought. Mai wielded sarcastic wit and an abrasive demeanor, channeling bitterness toward Maki and outsiders alike. She taunted Tokyo students like Megumi Fushiguro and Nobara Kugisaki, even provoking them with callous remarks about Yuji Itadori’s death. Yet she maintained guarded camaraderie with Kyoto peers Momo Nishimiya and Kasumi Miwa, enduring Aoi Todo’s antics with reluctant patience. Beneath her sharp exterior simmered insecurities born of familial oppression and her coerced existence as a sorcerer. In combat, Mai relied on a cursed-energy revolver, augmenting her strikes with the innate Construction technique. This ability materialized objects from nothing, but its crippling energy cost restricted her to crafting a single bullet daily. During the Kyoto Goodwill Event, she leveraged this limitation strategically, feigning a six-round capacity before conjuring a seventh bullet to ambush Maki. The gambit failed against her sister’s Heavenly Restriction-enhanced resilience, laying bare Mai’s struggle to overcome inherited disadvantages. Their fractured dynamic culminated during the Zenin clan’s massacre. Cornered by their father Ogi’s lethal assault, Mai sacrificed her life to forge the Split Soul Katana—a cursed tool that erased Maki’s residual cursed energy, unlocking her true potential. With her final breath, Mai reconciled their diverging fates, urging Maki to “destroy everything”—a plea that transmuted lifelong resentment into a defiant endorsement of her sister’s freedom. Mai’s enduring legacy rippled beyond death. Her sacrifice ignited Maki’s metamorphosis and the Zenin dynasty’s collapse, while the Split Soul Katana proved pivotal in battles against threats like the resurrected Naoya Zenin. Though rejecting conventional shonen arcs of growth, Mai’s choices crystallized the narrative’s focus on autonomy amid oppressive systems, her defiance etched into the ruins of the world she refused to embrace.