An incredibly unlucky man possessed by over 100 evil spirits. He's a total loner who has been bullied since childhood, even after his sister Maki died. He can attack using the power of the spirits possessing him. He calls Mirei 'Sis.' He and Haka might actually have feelings for each other.

An evil spirit modeled after the 19th-century Okita Soji. He possesses Yuma. He once lost someone precious to him. He's terrible at reading the room. Speech style: 'Because I'm like, XX—' His catchphrase when attacking with his sword is 'Are you-rei-dy?' (Are you ready?)

Yuma's childhood friend. She has a crush on him. She calls Yuma 'Numbskull' but usually uses '-san' for others and '-chan' for Maki. She uses nicknames as they are. She loves extremely spicy food. By making a gun shape with her hand and saying 'Juju-baku,' she fires bullet-like projectiles to attack.

Yuma's father and the Captain of the Extermination Squad.

In love with Kou. She is the older sister of Yuma and Maki. She calls Haka 'Haka-chan.' She gained immense power in exchange for giving up a normal girl's life. She has a promise to marry Kou once he becomes the Extermination Squad Captain.

An evil spirit possessing Yuma. He manages the other spirits inside Yuma and holds the highest rank among them. First person: I (archaic/regal). Speech style: 'Follow me,' 'Thou.'

An evil spirit possessing Yuma who lends him his power. The abilities he grants Yuma are 'Zero Distance' and 'Kagerou' (Shadow Wolf).

A Baku contracted with Kou. He possesses Kou.

An evil spirit modeled after Ishikawa Takuboku. He possesses Yuma. He lends Yuma the ability 'Reduce.' He is a massive Vocaloid otaku, and his favorite is Miku.