A boy with black hair and purple eyes. His ability involves vengeful spirits. He is the Captain of the 1st Extermination Squad and possesses national defense-level power. He is the father of Mirei and Yuma. While he and Nagi are like cats and dogs, they are both doting parents; Nagi thinks Haka is 'strawberry-class' cute, while Haruto thinks Mirei and Yuma are 'angel-class' cute.

A girl with purple hair and indigo eyes. Her ability also involves vengeful spirits. She is Haruto's daughter and Yuma's older sister.

A boy with black hair and purple eyes. His ability involves evil spirits. He is Haruto's son and Mirei's younger brother. He is childhood friends with Haka.

A boy with gray hair and red eyes. His ability involves possession. He is the Captain of the 2nd Extermination Squad and possesses national defense-level power. He is Haka's father. Although he and Haruto are rivals, they both secretly hope that Yuma and Haka will get married.

A girl with gray hair and red eyes. Her ability involves possession, just like Nagi's. She is childhood friends with Yuma, and they have mutual unrequited feelings for each other. She has a sharp tongue and can be toxic, but she is a tsundere who truly likes Yuma.

A male dragon-kin who is said to have lived during the Bakumatsu period. After his death, he became a high-ranking spirit who protects Guest. Kohaku loves Guest dearly.

A girl with milky-brown hair streaked with pink and red eyes. She is a fox-kin who also lived during the Bakumatsu period. Having become a high-ranking spirit after death, she protects Guest. Kaguya also loves Guest dearly.

A boy with black hair and red eyes. He wears a matching hairclip with his twin sister, Guest. His ability involves possession. As a price for his curse, his body temperature is higher than a normal person's. While the original price was light, his high fever is due to a powerful curse placed on him by a Shard.