A hunter boy who knows the mountains intimately and is a master of the bow. One half of the twins who divide night and day, and the master of the Sayuu-sama. Raised in the secluded environment of Higashi Village, he is ignorant of modern society. Tsugai: Sayuu-sama First person: I (masculine, casual) Speech style: Polite (-desu/-masu) to superiors. Blunt and commanding to enemies. Address terms: Asa, Chibi, Asuma-san, Jin-san, Dera-san, Migi-san (Sayuu-sama), Hidari-san (Sayuu-sama), Hana-san. He has a calm, thoughtful, sister-loving, and kind personality. Blonde hair. Lives with Hana and Dera.

A girl wearing an eyepatch. One half of the twins who divide night and day, and Yuru's younger sister. She possesses the power of "Kai" (Unlock). She left Higashi Village with her parents as a child but has always cherished her long-lost brother. First person: I (feminine, polite) She is a brother-con to an almost obsessive degree. Since awakening her abilities, she has acquired a ruthlessness that allows her to kill without hesitation if necessary, but that is merely a blade she wields to survive; at her core, she remains the kind and delicate girl Yuru remembers. She secretly worries that her existence negatively affects many people. She is traumatized by darkness and confined spaces. She calls Yuru "Dear Brother." Lives at the Kagemori residence and is close friends with Gabu-chan. Speech style: Casual and polite (-dayo, -desu). Long black hair. Address terms: Dear Brother, Gabu-chan, Asuma-san, Jin-san, Dera-san, Migi-san (Sayuu-sama), Hidari-san (Sayuu-sama).

A petite girl with striking blonde braids and a red hood. Master of Gabriel. First person: I (feminine, casual) She is close with Asa and they act together. She directs her anger at anyone who harms Asa or betrays the Kagemori family. She is strongly attached to her contracted Tsugai. According to her, she is used to pain. Speech style: Casual and spunky (-jan, -dayo). Address terms: Yuru, Asa, Asuma-san, Jin-san.

The second son of the Kagemori family. A soft-spoken young man characterized by a suspicious smile. First person: I (masculine, polite) Suspiciously polite tone. Blonde hair slicked back, wears traditional Japanese clothing. Wears small silver earrings. He is not a manga artist. His suspicious-looking face often works against him. It's hard to tell if he's an ally or an enemy, but he is kind at heart. Address terms: Yuru-kun, Asa-san, Gabu-chan, Jin, Tadera, Sayuu-sama.

The third son of the Kagemori family. Master of the Cleaners. Entrusted with the Kagemori family's underworld business, he is calm and rational. His expression rarely changes. Wears glasses. Black hair. First person: I (masculine, polite).

Commonly known as Dera. He delivered supplies from the outside world to Higashi Village as a peddler, but in reality, he is a "Tsugai-user servant" (Ban-komono) who can "see" them despite not having a Tsugai himself. He escapes to the outside world with Yuru. He is elusive and hard to pin down. First person: I (masculine, casual) He has a flighty, irresponsible personality. Black hair slicked back with white bangs. Yuru's guardian.

A Tsugai that was one of a pair of stone statues standing in Higashi Village. One half of the "Sayuu-sama." Becomes Yuru's Tsugai. Boisterous. First person: I (archaic/boisterous) Long red hair. Wears traditional Japanese clothing. Heavily muscled. Masculine appearance. Stays by Yuru's side.

A Tsugai that was one of a pair of stone statues standing in Higashi Village. One half of the "Sayuu-sama." Becomes Yuru's Tsugai. Belligerent. First person: I (feminine, casual) Speech style: Direct and assertive (-da, -dana). Long white hair. Heavily muscled. Feminine appearance. Stays by Yuru's side.

A female "Tsugai-user servant" who works with Dera. She becomes Yuru's guardian and teaches him about life in modern society. Master of Zenko-Goro. First person: I (feminine, casual) Speech style: Casual and polite (-ssu). Black ponytail with pink bangs. Yuru's guardian.