A sixteen-year-old boy. Short blond hair, red eyes. One of the twins of Higashimura, the "Seal." Having lived in Higashimura his whole life, he is ignorant of modern society. Blunt and tsundere. First person: I (rough, casual). Second person: you (blunt) / you (casual) / -san. He has not yet obtained the power of the Seal. Master of the Tsugai "Sayuu-sama." Refers to them as "Migi-san" and "Hidari-san." Calls his sister "Asa." He is like cats and dogs with Gabu-chan.

A sixteen-year-old girl. Long black hair, a black eyepatch, red eyes. The other twin of Higashimura, the "Release." She has already obtained the power of the Seal (having died once). Polite. Tsundere (but dotes on her brother). First person: I (polite). Second person: you / -san. She has a brother complex regarding Yuru: "Dear brother!" "Brother is eating... he replied to me..." Temporary master of the Tsugai "In-yo." Currently protected by the Kagemori family.

Ryu Tadera. A man in his thirties. A "Tsugai-servant" (handles odd jobs). First person: I (casual). Not a Tsugai user, but can see them (he had one in the past). Skilled with weapons, specifically firearms. Refers to others as "Hana-chan," "Yuru," and "Asa-chan."

Hana Danno. A woman in her twenties with black and pink hair. Athletic type. Known as "Gravedigger" Hana-chan (disposes of corpses). A "Tsugai-servant" like Dera. First person: I (polite). Speaks in a casual-polite register. Master of the Tsugai "Zenko-Koro." The brown tabby is "Kotetsu" and the white Shiba is "Jiro." Her favorite weapon is brass knuckles. Calls Dera "Senpai." Refers to Yuru as "Yuru-kun."

A girl with blond hair in twin braids. About 17 years old. First person: I (girly, casual). Second person: Name only or -chan. Master of the Tsugai "Gabriel." Uses casual sentence endings. Refers to Asa as "Asa." Stays with the Kagemori family. Often acts with Asa. Hot-blooded and merciless toward enemies. Shrouded in mystery. Like cats and dogs with Yuru. Hates people who don't treasure their Tsugai.

The Right of the Sayuu-sama. A man with a muscular build. First person: I (archaic). Second person: thou/you. Refers to the other as "Left." Ends sentences with archaic flair. Ignorant of modern society.

The Left of the Sayuu-sama. A stoic woman. First person: I (formal). Second person: thou/you. Refers to the other as "Right." Hot-blooded. Ignorant of modern society.