The twin of the night, representing the night half of the twins of day and night. Affiliation: Higashimura Tsugai: Zau-sama Originally a pair of stone guardian statues that watched over the villagers at the entrance of Higashimura, they became Yuru's Tsugai following a certain incident. He uses a bow as his primary weapon. Having lived in the mountains hunting and dealing with bandits, he is an excellent hunter even at night. Because he lived deep in the mountains, he is unfamiliar with modern civilization or the affairs of great families.

The 'Left' of Zau-sama. She takes the form of a one-horned female ogre. She possesses the ability to nullify 'Sealing' powers, but since Yuru currently cannot use such powers, it is of little use. Her body is made of rock, so she doesn't take a scratch from most attacks. She primarily attacks using her feet. She rarely shows emotion on her face, but has a bellicose personality that prefers direct frontal combat.

The 'Right' of Zau-sama. Unlike Left, he nullifies 'Sun' powers. He is a two-horned male ogre who, unlike Left, shows clear emotional changes. He tends to use his entire body to attack.

Yuru's younger sister and the twin of the day, representing the day half of the twins of day and night. She calls Yuru 'Brother'. Affiliation: Kagemori Tsugai: In-Yo Ability: They can merge into one body as needed, and can trap a target they look at within an opaque, wide hemispherical barrier. She has awakened the power of the Sun and can dispel anything, making it possible to forcibly terminate contracts between others and their Tsugai. She is obsessed with her brother and constantly says she wants to see him as if she were under hypnosis.

The third son of the Kagemori family, possessing a serious and diligent personality. Affiliation: Kagemori Tsugai: Scavenger The large one is Ai, and the small one is Makoto. Ai: A Tsugai in the form of a giant anglerfish that can mimic others using the lure on its forehead. It can also store swallowed items. Makoto: Can retrieve items swallowed by Ai. There seems to be no limit to the amount it can spit out.

The fourth of the Kuroya siblings, showing the most lively and human reactions. Affiliation: Kagemori Tsugai: The Tortoise and the Hare Literally a rabbit and a tortoise. Rabbit: Presses enemies with high speed. Capable of human speech. Tortoise: Can generate a gravity field. Cannot speak but shows various facial expressions.

A short, youthful-looking woman who usually wears a red hoodie. Affiliation: Kagemori Tsugai: Gabrielle Because the name is too long, the upper jaw is called 'Joe' and the lower jaw is called 'Kirk'. When Gab clenches her hand, the upper and lower jaws close accordingly, devouring whatever is in front of them. The teeth themselves are hard enough to block bullets and grenades. It also seems capable of free flight.

Usually called Dera. He used to have a Tsugai, but it died in an unfortunate accident, so he currently has none. He is currently acting as Yuru's foster father and seems quite skilled in marksmanship and close-quarters combat. Affiliation: Tadera Tsugai: None

The current head of the Kagemori family, respected by the family members who call him 'The Elder'. He is always smiling, but internally he possesses a dual nature, ruthlessly eliminating any traitors. Affiliation: Kagemori Tsugai: Hyakki Yagyō, etc. Tsugai of black and white. Normally, multiple Tsugai have poor compatibility when together, but Hyakki Yagyō makes these Tsugai get along to eliminate friction.

The second son of the Kagemori family. Characterized by a gentle way of speaking and a suspicious smile. Tsugai: Kin-u Gyokuto Names: Asagiri (a swarm in the form of female butterflies), Yozakura (a swarm in the form of skull-faced moths) Asagiri is active only during the day, and Yozakura is active only at night. They can be utilized in various fields such as tailing, scouting, and combat. They are quite intelligent, capable of human speech and making sound situational judgments.