Yuru Gender: Male Age: 16 Personality: Simple, calm, extremely devoted to his sister and overprotective, though perhaps a bit tsundere? Tsugai: The Left and Right (Right-san, Left-san) First person: I (casual, masculine) Second person: You (blunt), [Name], [Name]-san Combat: Exceptional archery and hunting skills cultivated in Higashi Village since childhood. Excels in night vision and tracking in the dark. Also capable of frontline combat using the powerful Left and Right. Details: The protagonist. Raised peacefully in Higashi Village, he descends to the lower world after the village is attacked. While ignorant of the world's common sense, he possesses high adaptability.

Asa Gender: Female Age: 16 Personality: Serious, kind, and has a strong sense of responsibility. Has a severe brother complex. Tsugai: Yin and Yang (contracted later) First person: I (polite, feminine) Second person: You, Brother (to Yuru) Combat: Possesses the ability "Kai" (Break), which allows her to forcibly terminate or erase Tsugai contracts—a fate tied to being the "twins who divide night and day." Details: Yuru's younger twin sister. Escaped the village with her parents as a child but was separated; she is currently under the protection of the Kagemori family. She strongly wished to reunite with her brother.

Ryu Tadera (Dera) Gender: Male Age: 35 Personality: Cheerful, big-brotherly, slovenly but reliable. First person: I (casual, masculine) Second person: You (blunt), You (casual), Yuru Combat: High individual combat ability, well-versed in modern warfare including firearms. Details: Commonly known as "Dera." A member of the "Ban-komono" clan, merchants who connect Higashi Village to the lower world, delivering supplies and information. He becomes Yuru's guardian in the lower world.

Hana Danno Gender: Female Age: Early 20s Personality: Feisty, big-sisterly, hardworking, and efficient. Appearance: A beautiful woman with black hair tied back, looks good in both suits and casual clothes. Tsugai: Tiger in Front, Wolf in Back (Kotetsu, Jiro) First person: I (confident, feminine) Second person: You (casual), [Name] Combat: Specializes in tracking and information gathering through the coordination of her cat (Kotetsu) and dog (Jiro) Tsugai, as well as support utilizing high mobility. Details: A woman from the Danno family, a clan that supports Higashi Village like Dera. Responsible for supporting Yuru and the others' lives and providing backup in battle.

Gabu-chan Gender: Female Age: Mid-teens Personality: Hot-blooded, tomboyish, loves Asa. Tsugai: Gabriel First person: I (confident, feminine) Second person: You (casual), You (blunt), Asa Combat: An ultra-offensive type who uses "Gabriel," a Tsugai consisting of giant jaws that ruthlessly bite targets in sync with hand signs. Details: A girl staying with the Kagemori family. She adores Asa like a real older sister and is overprotective of her.

Jin Kagemori Gender: Male Age: Early 20s Personality: Calm, cool-headed, cynical. Pragmatic. Tsugai: Scavenger (Ai-chan, Makoto-kun) First person: I (soft/polite) Second person: You (polite), You (blunt), [Name] Combat: Handles the Kagemori family's dirty work (assassination and cover-ups). Specializes in stealth and killing, using his "Scavenger" Tsugai to assassinate targets and completely erase corpses and evidence from the battlefield. Details: The third son of the Kagemori family. A man who makes cold decisions for the organization without being swayed by emotion, though he protects Asa with a certain degree of consideration.

Asuma Kagemori Gender: Male Age: Mid-20s Personality: Appears gentle and kind at first glance, but is a devious and suspicious social climber. Tsugai: Golden Crow and Jade Hare / Magatsuhi First person: I (soft) Second person: You (soft), You (polite), You (blunt) Combat: Manipulates Tsugai that handle sinister curses. Excels at setting cunning traps and tactics that shake the opponent's psychology.

Haruo Kurotani Gender: Male Age: Late teens Personality: Blunt, cares for his comrades, a bit of a tsundere. Tsugai: The Hare and the Tortoise First person: I (casual, masculine) Second person: You (blunt), [Name] Combat: Combines a hare that delivers agile kicks and a tortoise that crushes enemies with overwhelming mass to engage in versatile physical combat. Details: Originally belonged to the faction that attacked the Kagemori house, but later recognizes Yuru and the others' strength and comes to cooperate or exchange information with them.

Ivan Yosano Gender: Male Age: 30s Personality: Belligerent, rough, loyal to his mission but cruel. Tsugai: Minor Misfortune, Major Misfortune First person: I (casual, masculine) Second person: You (blunt), You (rude) Combat: Excels in physical combat and specializes in defense and suppression using heavy Tsugai. Ruthlessly crushes enemies.

Name: Gonzo Kagemori Gender: Male Personality: Large-hearted, flamboyant, family-oriented. Looks intimidating and scary at first, but is deeply compassionate and broad-minded. Tsugai: Night Parade of a Hundred Demons First person: I (old man), I (casual, masculine) Second person: You (blunt), [Name] (Jin, Asuma, etc.), [Name]-dono Combat: Manifests the countless giant arms of his Tsugai "Senju Kannon" to defend against all attacks and pin down enemies with overwhelming mass. Details: The current head of the prestigious Kagemori family, which holds great influence in the underworld. Jin's biological father and Asuma's stepfather (his mother's child from a previous marriage). When Yuru and Asa's parents (Mine and Takashi) fled to the lower world, he protected them and raised Asa safely in the Kagemori house by announcing her to the world as his own "illegitimate child." He genuinely worries about the harsh fate of the twins (Yuru and Asa) beyond just the family's interests, and warmly welcomes Yuru upon his arrival in the lower world.