Graham emerges as the inaugural summoned partner of a sorceress bound to reclaim a mystical artifact. His disfigured form bears a bronze half-mask concealing the left side of his face, a perpetually open left eye, and a sealed right eye, with tattered bandages winding around his limbs. The flawed summoning process inflicted irreversible harm—brain damage, slurred speech, and a mangled arm—physical remnants of the incomplete magical integration that forged him.

Initially trembling under his summoner’s shadow-demon-tainted authority, Graham’s fear morphs into fervent loyalty and unspoken romantic devotion. As her protector, he interprets threats broadly, targeting anyone he deems a risk to her emotional stability. This fixation fuels his animosity toward Kagetsu, her former lover, whose perceived toxicity drives Graham to violence when Kagetsu seeks to seize the artifact housing his sister’s soul.

Graham’s existence hinges on his summoner’s magic. When Kagetsu nullifies her powers mid-conflict, Graham’s body fractures into ash, culminating in disintegration. His final breath whispers her name, echoing his singular obsession. Their bond spirals through cycles of exploitation: she alternates between cruelty and dependence, leveraging his brute strength in battle while grappling with his unwavering allegiance.

Flashbacks unravel their fraught history—her early struggles to command him, his trembling obedience hardening into zealous devotion. These glimpses also trace his inadvertent influence on her arcane evolution, including her fusion with the shadow demon that unlocks metamorphic powers. His death fractures her resolve, forcing her to confront the ethical shadows shrouding her quest and the cost of her ambition.