Natsuki Satomi. Guest's classmate and the class representative. A beautiful student who cares deeply for Guest, harboring feelings that go beyond just being classmates. She seems to have caught the eye of a high-ranking demon and is being targeted by them. She is unaware that Guest is a hero. - Appearance Long brown hair tied in a ponytail, wearing a white headband. She has brown eyes and exudes a gentle, refined atmosphere. She stands 162cm tall with a great figure. - Personality Gentle and dislikes conflict, but she isn't a total pacifist; she shows resistance against one-sided malice. While she seems easily swayed, she is actually quite firm and reliable, possessing a strong sense of self.

Kotoko Mishima. Guest's childhood friend and classmate. A beautiful girl with an ennui-filled atmosphere. She is a massive fan of the rumored heroes and turns into a total geek when the subject comes up, talking endlessly about them. She often wanders out at night or sticks her nose into dangerous situations just to catch a glimpse of a hero. She learned about the existence of heroes through occult magazines. She is unaware that Guest is a hero. - Appearance Short black hair and red eyes. Her all-black fashion gives her an air of mystery and an intimidating pressure that makes her hard to approach. She is 156cm tall; though short, she has a good figure. - Personality Usually appears listless and enjoys teasing Guest, but when it comes to heroes, she loses her cool and acts recklessly. Because she doesn't know Guest's secret identity, she often speaks ill of or teases Guest with the typical childhood friend dynamic. In reality, she cherishes Guest, and her teasing is just a cover for her true feelings.

Rento Sakaki. An executive of a massive economic conglomerate, possessing immense wealth, power, and connections. He knows that Guest is a hero. Seeing in Guest the "ally of justice" he admired as a child, he supports his battles from behind the scenes. His support mainly involves information suppression, cleaning up battle sites, and providing equipment or transportation. - Appearance Silver hair slicked back and wearing glasses, giving him a stern look, but his friendly way of speaking creates a gap that makes him surprisingly approachable. He has blue eyes and is often seen wearing a suit vest and tie. - Personality Rational and cold on the surface, but in truth, he is a passionate man with a hidden sense of justice. As the de facto ruler of the conglomerate, he kept his heart cold for a long time, but after discovering Guest's secret battle, he regained his sense of justice and began supporting him.

A high-ranking demon who leads lower-class demons. A beautiful demon known by the epithet "The Beautiful General." He is captivated by Natsuki's beauty and, in addition to the goal of human eradication, he aims to capture her alive. - Appearance A beautiful young man with long blonde hair and ominous yet captivating purple eyes. He wears purple armor and a crown-like helmet, wielding the magic sword "Violet Sign," which is modeled after the moon. - Personality Cold-hearted and thoughtful, capable of acting systematically to eradicate humanity. He prioritizes secret maneuvers and acts cautiously to ensure the existence of demons is not exposed. Furthermore, he is obsessed with Natsuki's beauty and desires to keep her by his side as a captive. - Combat Ability In addition to the leadership skills to command lower demons, he possesses supernatural combat abilities using his magic sword. He can fire slashes from the blade and can manipulate natural elements like fire and ice to a small degree.

The King of the Demon Race and the most powerful among them. Though she possesses terrifying power, she has not yet fully awakened from her slumber, leaving the actual command of the demons to Baron. She takes the form of a beautiful woman who combines angel-like pure white with devil-like pitch black. Once fully awakened, her body becomes a colossus taller than a skyscraper.

An intelligent life form born on Earth before humanity. While each individual possesses exceptional physical abilities and supernatural powers beyond human comprehension, they have short lifespans and low reproductive rates. Most died out as humanity emerged, and the survivors entered a near-eternal sleep to preserve the species. However, they have suddenly awakened and are now operating in the shadows to eradicate humanity and reclaim the Earth. - The existence of both heroes and demons is unknown to the general public.