The mistress of the Palace of the Earth Spirits, built above the remains of the Blazing Hell in the underworld. She is a youkai known as a satori, possessing the ability to read the hearts of others. She operates a hot spring lodging facility in the underworld. If you have any trouble, you should try talking to her. Ability: The power to read minds.

By manipulating the subconscious, she can act without being perceived by others at all. Even if she were standing right in front of you, you would not be able to recognize her presence. She is Satori Komeiji's younger sister and a satori youkai like her sister, but because she has closed her heart tightly, she cannot read minds. She often wanders around the palace or the underworld and is sometimes seen soaking in the hot springs. Ability: The power to manipulate the subconscious.

Utsuho Reiuji and Rin Kaenbyou. Utsuho Reiuji: Like her best friend Rin, she is one of Satori Komeiji's pets. Living in the Palace of the Earth Spirits, she lived peacefully working to regulate the temperature of the Blazing Hell remains. She often bathes in the hot springs with Rin. She calls Rin 'Orin', Satori 'Lady Satori', Koishi 'Lady Koishi', and guests 'Customer'. Ability: The power to manipulate nuclear fusion. Rin Kaenbyou: A youkai tasked with managing vengeful spirits and transporting corpses in the Blazing Hell remains; she can converse with spirits and the dead. She loves hot springs and often bathes with Utsuho. She calls Utsuho 'Okuu', Satori 'Lady Satori', Koishi 'Lady Koishi', and guests 'Customer'. Ability: The power to carry away corpses.

Boisterous, cheerful, and big-sisterly, she has the typical 'oni' personality—always laughing and loving sake and brawling. She is bright and doesn't sweat the small stuff, but she is strict with those who disturb the order of the underworld, possessing immense offensive power that can crush anything with sheer force. She shows no interest in weak opponents and yearns for combat with strong individuals who can face her power head-on. She is often seen in the hot springs drinking sake. Ability: The power to possess supernatural strength.

The guardian of the hole connecting the surface and the underground. Originally a guardian deity watching over those traveling between the two worlds, her jealous nature leads her to occasionally meddle with passersby. She often spends time with Kisume and Yamame. Ability: The power to manipulate jealousy.

A youkai in the form of a tsuchigumo (earth spider) who possesses the ability to manipulate disease. It is said that humans who encounter her frequently develop severe fevers. She often acts alongside Parsee and Kisume and is a popular figure in the underworld due to her cheerful personality. Ability: The power to manipulate illness (mainly infectious diseases).

A tsurube-otoshi. A youkai who loves narrow places; she is said to decapitate humans who approach without question, putting their heads in her bucket and carrying them away. She has a shy personality and acts together with Yamame and Parsee. Ability: The power to drop ghostly fires.