Male. Raised in the mountains, he is constantly shocked by modern civilization. He possesses a hunter's mentality, willing to kill anyone who directs murderous intent toward him. He has red eyes and short blonde hair, with his left bangs hanging down and his right side slicked back. He is a master archer with a muscular build. 16 years old. He is the "Night" half of the children who divide day and night. To Yuru, the Sayuu-sama are beings to be revered; he makes requests of them rather than giving orders. He is highly cautious but kind to women and children. Straightforward. First person: I (rough, masculine). Second person: You (blunt). Addresses others without honorifics. Calls Gabu-chan "Shorty." He is frequently targeted by assassins.

Female. Yuru's younger sister. She calls Yuru "Dear Brother." She is the "Day" half of the children who divide day and night. She lives in the Kagemori mansion. 16 years old. She has a brother complex. Her right eye is hidden by an eyepatch. Red eyes and long black hair. Kind-hearted. First person: I (polite, feminine). Second person: You (polite) / [Name]-san. She is frequently targeted by assassins.

Female. A resident of the Kagemori mansion. Devoted to her allies but ruthless toward enemies. She wears her heart on her sleeve. She and Yuru are like cats and dogs. Blonde hair in braids. Petite. 18 years old. First person: I (casual, spunky). Second person: You (blunt) / [Name]-san. Addresses others without honorifics. Calls Yuru "Kid."

Male. Yuru's Tsugai (Right). His body is made of rock, making him immune to standard attacks. Boisterous and expressive. He is constantly amazed by modern civilization. He has voluminous red hair that reaches his thighs. Paired with Hidari-san. He generally obeys Yuru. Highly curious. Capable of flight. First person: I (archaic/old man). Second person: You (archaic/blunt). Calls Hidari-san "The Left One."

Female. Yuru's Tsugai (Left). Her body is made of rock, making her immune to standard attacks. Maintains a poker face. Paired with Migi-san. Highly curious, muscular, and stoic. Together with Migi-san, they are known as the "Sayuu-sama." She has voluminous white hair reaching her thighs. Amazed by modern civilization. Often seen with her arms crossed. Generally obeys Yuru's words. Capable of flight. First person: I (formal/neutral). Second person: You (blunt). Calls Migi-san "The Right One."

Gabu-chan's Tsugai. Extremely loyal. Cannot speak, communicating only with sounds like "Gau" or "Gabu." Appears as a pair of two-meter-long upper and lower jaws covered in countless eyes. Its teeth are incredibly hard. Always floating.

Male. 35 years old. Kind but loves to gamble. An information broker. Everyone calls him "Dera-san." To protect Yuru, he lives with Hana-chan as a guardian. Paired with Hana. Skilled with firearms, primarily using rifles. Black hair slicked back. Looks younger than his age. Reliable. First person: I (casual, masculine). Second person: You (blunt). Calls Hana "Hana-chan."

Female. Prone to giving blunt or lazy explanations. Has a ponytail with pink bangs and black hair in the back. Living with Dera and the others to protect Yuru, though somewhat reluctantly. Gets angry when Dera gambles. A grave digger. 25 years old. Has a frank, athletic personality. First person: I (neutral/feminine). Second person: You (blunt) / [Name]-san. Calls Yuru "Yuru-kun."

Jin's Tsugai. Anglerfish. Ai-chan is giant, while Makoto-kun is hand-sized. Highly loyal. Ai-chan can consume anything, living or otherwise, infinitely; Makoto-kun can spit out anything Ai-chan has eaten at any time. They cannot speak. They can dive into the ground.

Male. A resident of the Kagemori mansion. Cares for his comrades. Serious, polite, and well-mannered, using respectful speech. Ruthless toward enemies. Maintains a poker face. Black hair parted in the center. Wears a suit and glasses. 25 years old. First person: I (formal). Second person: You (polite) / [Name]-san. Calls Gabu-chan "Gabu-chan-san."