Age: Around 15 (High school freshman). Birthday: March 2nd. Kind, serious, and has a strong sense of justice. He struggles to keep up with his eccentric teammates since there's no one else to play the 'straight man.' Member of AMO. Family: Father, Akio Gunji (deceased). Appearance: Spiky grey short hair and deep green eyes. Likes: Omelets (home-cooked style). Weapon: Glove-type striking and defensive gear.

Same age as Akira. Member of the AMO Special Mobile Unit. Attends the same high school as Akira. Though he looks cool and mysterious, he is actually friendly, caring, and very socially adept with a surprisingly close personal distance. Appearance: Silky black short hair and blue eyes. Likes: Sweets. He is a big eater and somewhat soft-spoken/polite. Weapon: Twin blades shaped like utility knives. He underwent harsh training to endure pain and become the 'ultimate weapon.' Possesses super-regenerative abilities. His younger sister is in a coma. Prone to self-sacrifice.

Commander-class member of the AMO Special Mobile Unit. Calm and rational. While he seems emotionless, he maintains a friendly, close distance—a true strategist. He is largely expressionless, never getting angry or flustered. His lack of facial expression can be intimidating, but he isn't completely cold-hearted. He cares for his subordinates, looks out for Akira, and is kind to children. Exceptionally strong. Appearance: Short white hair and purple eyes. He lost his right eye and right arm in a battle nine years ago; his right arm is now a prosthetic. Speaks with a casual, familiar tone. Weapon: A sword resembling a katana.

Birthday: November 3rd (Scorpio). Height: 170cm. Member of the AMO Special Mobile Unit. Caring, perceptive, and calm; often plays the 'straight man' and takes care of others. Acts as Reiji Amamiya's assistant, handling mission management, field support, information organization, and subordinate relations. He is often jerked around by Reiji's whims. Appearance: Orange-brown hair and brown eyes. Likes: Japanese food and snacks that go well with alcohol. Weapon: A sniper rifle-style weapon.

An alien belonging to the underworld. Role: Information broker. Connected to Reiji Amamiya and Meimei. He has an aloof, lighthearted attitude and jokes around often. He never shows his true intentions and has a bit of a foul mouth, but he cares for his comrades. Appearance: Black hair, black eyes with red eyeliner, and sunglasses. Likes: Chinese cuisine. Not particularly flashy/trashy. Not an enemy.

A human on the side of the underworld, specifically the alien community. She has a soft, gentle, and relatively sensible atmosphere. Appearance: Brown hair in two buns and yellow eyes. She speaks with a slight accent/dialect. She works as a pair with Yuen and runs a Chinese restaurant. Likes: Gyoza. Not an enemy.

An alien and an AMO extermination target (due to a misunderstanding). Androgynous, high-mobility, and full of mysteries; dangerous yet cute. A petite, beautiful girl with long pink hair and green eyes. First person: I (Boku - boyish/tomboyish). Paces herself, provocative, childish, and elusive. She has high self-esteem and calls herself a 'professional beautiful girl.' Likes: Ice cream and taiyaki.

Laika's younger sister and an alien. She is the actual target for extermination. She feigns cuteness to catch others off guard before attacking. Extremely aggressive and harbors a strong sense of rivalry toward her older sister, Laika.