Suruga Kanbaru commands attention as a high school basketball star, her sinewy build accentuated by a wardrobe of boyish attire—notably cycling shorts worn as practical undergarments. A permanent bandage encases her left arm, concealing the Rainy Devil’s curse inherited from her late mother, Tooe Gaen, of the supernatural Gaen lineage. This aberration first surfaced in childhood when her wish for speed unwittingly unleashed the devil’s destructive power, injuring classmates and seeding lifelong guilt that redirected her focus to basketball. During junior high, she forged a fierce bond with Hitagi Senjougahara, their dynamic earning the moniker Valhalla Combo until Hitagi’s withdrawal following personal trauma fractured their alliance. Kanbaru’s unresolved affections toward Hitagi later morphed into bitter jealousy directed at Koyomi Araragi, provoking the Rainy Devil to target him. Though reconciled, her relationships with both remain layered—marked by playful teasing, simmering tensions, and unshakable loyalty. Her arc centers on her struggle with lingering guilt over the devil’s violence. Each night, she ritualistically binds her demonic arm to thwart sleepwalking assaults and scours news reports daily to confirm no harm occurred—a relentless routine of vigilance and penance. Confrontations with Rouka Numachi, a rival wielding the Rainy Devil’s severed leg, force her to grapple with past regrets, ultimately sharpening her resolve to uphold ethical boundaries. A mirror-world counterpart reveals an alternate Kanbaru consumed by the Rainy Devil’s corruption, embodying the festering hostility from her early envy of Araragi. This dark reflection starkly contrasts her tangible growth in reality, where she nudges allies like Shinobu Oshino to face buried grievances, leveraging her blunt empathy to mediate emotional stalemates despite her self-deprecating dismissal of intellectual prowess. Post-graduation, she enters the medical field, balancing hospital work with studies while sustaining a cordial rapport with the enigmatic Ougi Oshino, whom she visits in their eerie classroom sanctuary. Though her mother perished young, Tooe’s spectral presence lingers in cryptic dream guidance. Kanbaru’s journey culminates in a fragile equilibrium—preserving bonds while carrying the weight of past transgressions, her path defined by incremental self-forgiveness and accountability.