Shimei Ryomou, a third-year Nanyo Academy student and Big Four member, wields B-rank combat expertise specializing in joint locks, throws, and handcuffs. Her hybrid fighting style melds chi blasts with wrestling-inspired maneuvers, often executed in a distinctive blue French maid outfit. A black eyepatch conceals her left eye, binding a symbiotic dragon merged with her during a desperate intervention to save Ryuubi from self-destruction. This entity healed her mortal wounds and amplified her abilities, though the eyepatch curbs its influence at a perilous cost. Shadowed by an undefined tragic past, she shares years-long ties with Teifu Tokubou and Genpou Saji. Unrequited affections intertwine their dynamic—she harbors feelings for Saji, while Teifu pines futilely for her. A pivotal tournament incident where she rescued Teifu left him blinded and wheelchair-bound, cementing her initially aloof, sadistic demeanor. Interactions with Hakufu Sonsaku gradually thaw her guarded exterior, revealing emotional vulnerability beneath a stoic facade. Early arcs showcase her ruthless efficiency: shattering limbs, deploying chokeholds, and clashing with Hakufu in battles that evolve from hostility to mutual respect. A confrontation triggering Hakufu’s dragon awakening forces Shimei’s defeat, while Saji’s sacrificial arm loss to save her from Hakufu’s possession ignites smoldering loyalty and inner turmoil. The dragon’s presence fractures her psyche into a dual nature—a timid core juxtaposed with a provocative alter-ego—though less unstable than peers. Manga iterations depict her hair shifting inexplicably from blue to black, while anime adaptations strip her backstory ties to Seito and Ryuubi, presenting the dragon as independently rooted and her persona as icier. Strategic engagements against elites like Myousai and Teni highlight her tactical retreats to safeguard allies or secure artifacts like the Dragon Jade. The Great Guardians arc tests her resilience through Ryofu Housen’s psychological torment and physical domination, including a violating encounter that fuels vengeful resolve. She retaliates by overwhelming Yoshu fighters in tournaments, later training alongside Hakufu under Master Chouko. Post-Battle of Chibi, she balances combat duties with a cosplay cafe role, adopting a whimsical cat-maid ensemble and heart-shaped eyepatch symbolizing evolving identity. Her adaptability shines against adversaries like Unchou Kan-u, exploiting grappling mastery despite skill disparities, and aiding Hakufu in dismantling curses or confronting threats like Chuuei Toutaku. Across narratives, she transforms from an isolated enforcer into a layered operative navigating loyalty, supernatural power struggles, and survival, etching her trajectory through tactical ingenuity and reluctant alliances.