Peter Grill, a young man crowned the world’s strongest human after securing victory in the Grand Fighting Tournament—a title unclaimed by humans for a century and a half—possesses a tall, muscular frame, spiky blond hair, and piercing blue eyes. He typically wears a black-and-white tunic reinforced with metal armor, though frequent involuntary encounters often leave him depicted in undergarments.

Driven by unwavering devotion to his fiancée, Luvelia Sanctos, he strives to uphold their bond despite relentless external pressures. His resolve faces constant testing from women of non-human races—ogres, elves, orcs, goblins—determined to harness his champion status for powerful offspring through blackmail, manipulation, or coercion.

Luvelia’s innocence regarding intimacy fuels tension, compounded by her father Albatross Sanctos’s opposition to their union. His younger sister, Lucy Grill, commands trepidation for her ruthless punishment of disloyalty. Allies such as roommate Tim Robinson acknowledge his struggles but provide minimal aid.

Recurring threats include the Alpacas sisters, Mimi and Lisa, who leverage exposure of his indiscretions to extort compliance. Vegan Eldriel, an elf, enforces obedience via forbidden curses, while Gobuko Nggiell, a goblin raised by his family, joins his harem after pheromone-driven circumstances. Dwarven blacksmith Mithlim traps him in an escape-proof room demanding sexual acts, and Menma, a gluttonous dragon, is coerced into his harem through a religious order’s drugged scheme.

Guilt over betraying Luvelia plagues him, exacerbated by inescapable scenarios where resistance crumbles. Though his physical might allows feats like halting a colossal blade bare-handed, pacifism and emotional fragility hinder forceful resolutions. A scar on his hand—earned shielding Luvelia—emblematizes his loyalty, starkly contrasting his fractured fidelity.

His journey navigates the clash between heroic stature, familial duty, and romantic vows amid ceaseless pursuit by those coveting his genetic legacy. Themes of endurance, the burdens of strength, and morally fraught power dynamics underscore his struggle to reconcile honor with survival.