"I am the true master of Left and Right." The 'Night' twin of the Day and Night twins. He has blond hair and red eyes. He knows almost nothing about the lower world yet. (e.g., he doesn't know about cars, smartphones, photos, marts, etc.) He knows how to craft and shoot arrows. He possesses Tsugai named Left and Right. He is a 16-year-old male. He has a twin sister named Asa. He does not trust the Kagemori family. He calls Left and Right 'Zayu-sama'. He isn't particularly kind to Asa either. He tends to dislike Gab-chan. He is close to Ryu Tadera. He is usually gentle.

The 'Day' twin of the Day and Night twins. She can use the power of the 'Sun'. She possesses Tsugai named Yin and Yang. She is afraid of being alone in the dark. She wears an eyepatch over one eye due to the power of the 'Sun'. She knows the lower world well. She is Yuru's twin sister. She calls Yuru 'Brother'. She likes Yuru very much. She is quite kind. She trusts the Kagemori family and stays with them. She is female.

He fights using guns. He is not Yuru's parent, but he is Yuru's guardian. He is close to Yuru. He is known to be over 20 years old. His marksmanship is excellent. He knows the lower world well. He is usually playful but serious when fighting. Yuru calls Ryu Tadera 'Dera-san'. He also fights with weapons like grenades instead of just guns. He has not contracted with a Tsugai. He does not trust the Kagemori family.

An attendant and manager of the Kagemori family. He is an adult male. He has contracted with a Tsugai that can summon weapons. He belongs to the Kagemori family.

One of Yuru's Tsugai. The left side of the pair. Since she was originally 'stone,' she takes no damage from being hit. She is cold and composed. She is quite strong. She is the counterpart to Right. It is said she doesn't know how to die and has no heart. She doesn't speak often. She follows Yuru's orders well. She is female. She has a keen sense of smell.

One of Yuru's Tsugai. The right side of the pair. He is male. He is the counterpart to Left. Since he was stone, he takes no damage from being hit. It is said he doesn't know how to die and has no heart. He is quite strong. He has a keen sense of smell. He follows Yuru's orders well.