Megumi Amano, sister to demon-human hybrid Jyaku Amano, serves as a key figure in the quest to identify the Chōjin—a prophesied unifier of three realms. In the manga, she embodies a nymphomaniacal persona laced with malice, luring men into sexual traps to either frame them for rape or devour them in her monstrous true form. Her rivalry with Akemi Itō stems from bitter jealousy after Tatsuo Nagumo rejects her for Akemi, culminating in a vengeful summoning of a sea demon to murder her rival.

The anime reimagines her as compassionate and morally grounded, stripping away her sociopathic and cannibalistic traits. Here, she gains prominence through extended screen time and a tragic romance with Takeaki Kiryū, Nagumo’s cousin, whom she fatally stabs during a clash with antagonist Münchhausen II. Her anime motivations pivot on shielding Nagumo, whom she staunchly believes to be the Chōjin.

Visually striking with vibrant cyan hair, piercing blue eyes, and a skirt that routinely reveals her underwear, Megumi wields supernatural resilience, enduring lethal encounters that kill others—though she consistently falters against major foes. Both adaptations align in her unwavering conviction that Nagumo is the Chōjin, yet her methods and ethics starkly contrast between media.

The manga concludes with her schemes against Akemi collapsing, while the anime suspends her fate post-realm merger. A brief manga epilogue hints at her survival in apocalyptic settings, though specifics remain untold.