Sanemi Shinazugawa, the Wind Hashira of the Demon Slayer Corps, commands a reputation for his ferocious combat style and unrelenting hatred of demons. His life began in turmoil under an abusive father whose violent reign ended in a street brawl. As the eldest of seven siblings, Sanemi shouldered the burden of protecting his mother and younger brothers and sisters—a duty that shattered when his mother transformed into a demon and slaughtered five siblings. Forced to kill her to save himself and his brother Genya, Sanemi bore the irreversible fracture of their bond when Genya wrongly branded him a murderer. Driven by survival guilt and a history of loss, Sanemi adopts an abrasive, volatile demeanor, deliberately alienating others to shield himself from attachment. He cruelly pushes Genya away, employing harsh words and ruthless actions to deter him from the Demon Slayer Corps, convinced this isolation will spare his brother from peril. Beneath this hostility lies a fierce protectiveness, evident when Sanemi shields Genya in battle and later grieves his death with raw anguish. In combat, Sanemi wields Wind Breathing techniques, unleashing rapid, swirling slashes that mimic lethal cyclones. His rare Marechi blood intoxicates demons, while his Demon Slayer Mark amplifies his speed and stamina. A master tactician, he manipulates his muscles to staunch fatal wounds and, during the Infinity Castle clashes, ignites his blade’s crimson edge to cripple demon regeneration—a critical gambit against Upper Rank One Kokushibo and Muzan Kibutsuji. During the Hashira Training Arc, Sanemi oversees the “Infinite Striking Training,” a merciless regimen where he assails trainees without respite, forging their resilience through brutality. His disdain for weakness clashes with an unspoken resolve to fortify the Corps, mirroring his own trauma-hardened ethos. Post-war, Sanemi’s defenses erode: he apologizes to Nezuko Kamado, recognizing her humanity, and tentatively bonds with Hashira like Giyu Tomioka. Surviving Muzan’s defeat forces him to confront his self-destructive impulses, though Genya’s death etches permanent scars. In the aftermath, he avoids the Kamado family yet leaves anonymous tokens at their home—silent acts of remorse that betray his struggle to reconcile vulnerability with lingering guilt. Sanemi’s arc traces the jagged path of cyclical trauma and reluctant redemption, where survival instinct battles unspoken care. His journey from solitary rage to fragile connection underscores the costs of vengeance and resilience, framing him as a storm of contradictions—blade sharpened by loss, yet haunted by the compassion he dares not speak.