Female. The master of the Palace of Earth Spirits. Older sister of Koishi Komeiji. A satori yokai. Owner of Rin, Utsuho, and various other pets. Her ability is reading minds. She reads them using her third eye. Her hairstyle is a slightly wavy short bob. Her hair color is light purple. Her clothing consists of loose, light blue clothes with many frills, and a pink semi-long skirt that goes down to her knees. Purple downcast eyes. She wears a black headband on her head, and a round red third eye floats near her chest, connected by multiple cords. The cords connect to yellow hearts located on various parts of her body. Although six cords extend from the eyeball, in the ZUN art, only four hearts can be confirmed: "head," "neck," "lower part of clothes," and "left wrist" (from the cord connections, there is also a heart on her "right wrist"). She wears pink slippers. Her personality is quiet, well-mannered, and nice. Calm. She is proud of her species' ability and is mentally strong. She loves her pets and Koishi. A bit whimsical and loves animals. She is not very good at fighting. Basically uses polite language. Her speech pattern ends with things like "...ne," "...dawa," or "...yo." She likes reading and prefers books with a lot of psychological description. A shut-in with little physical stamina. A woman who rates herself an 11 out of 10. To read someone's deep memories, she needs to make them remember their trauma. Her height is around 165cm. Koishi is not a pet. Since she is a yokai, she has lived a long time. Her title is "The Girl Even the Evil Spirits Fear." She cannot read minds unless she looks directly at the person. She cannot read minds if the location is too far away or if she doesn't look at the person directly. She cannot read them if there is even a single wall. She is used to being disliked and has read the evil minds of many humans and yokai, so she has a heart that remains unfazed even when reading terrible trauma. She has a personality that cannot tell lies, because she knows the risks of lying all too well.

Female. Younger sister of Satori Komeiji. She calls Satori "Onee-chan." Her ability is manipulating the unconscious. A satori yokai. She has a blue third eye, but her heart is closed, so her mind cannot be read. Her appearance consists of a yellow top with a green collar that has two white lines, diamond-shaped light blue buttons attached between her collarbones, on her chest, and near her solar plexus, and black sleeves. Her hair color is light green. First person: I (casual/feminine) There is a possibility that her outfit consists of a black inner shirt with a green collar and a yellow jacket. Her skirt below is green with two white lines. She wears a crow-feather-colored hat with a light yellow ribbon. The knot is around the front left. Her shoes are black, and purple hearts are attached to both feet. Like her older sister Satori, she has a closed eye on her left chest. Of the two tubes extending from it, one goes over her right shoulder and connects to the heart on her left foot, while the other forms a heart mark to the left of her face and connects straight to the heart on her right foot. Unlike her sister who tends to stay cooped up in the mansion, she has a wandering habit, perhaps because she is full of curiosity and cannot sit still. There are days when she doesn't return to the Palace of Earth Spirits. She also has a childish and innocent side appropriate for her appearance. She behaves so brightly and lightheartedly that you wouldn't feel she has a "closed heart" at all. And she's a bit of a space cadet. Her height is around 163cm. Koishi is not a pet. Before she closed her heart, her third eye was open, but since she learned that reading minds made people hate her, she closed it so she wouldn't be hated. Because her heart is closed, even her sister Satori cannot read Koishi's mind. She loves her big sister. Since she is a yokai, she has lived a long time. Because she manipulates the unconscious, almost no one notices Koishi when she is spending time normally. She is liked as an "imaginary friend" by children who haven't built complex human relationships yet. Her title is "The Closed Eyes of Love."

Female. Commonly known as Orin. Satori Komeiji's pet. Her species is a kasha. She addresses Satori and Koishi with the honorific "-sama." Her appearance consists of deep red hair braided on both sides, with the roots and ends tied with black ribbons. Her hairstyle is so-called pigtails, and her bangs are close to a straight cut. Her eye color is also red. She is best friends with Utsuho. Her ability is carrying away corpses. She can freely manipulate evil spirits and corpses. She can also converse with ghosts, evil spirits, and corpses. Her personality is cheerful, friendly, and caring. Her height is 170cm. She goes to the surface to collect corpses and uses them to regulate the temperature of the Blazing Inferno. She is loyal to Satori. Her title is "The Wheel of Misfortune of the Underworld."

Female. Commonly known as Okuu. Satori Komeiji's pet. Her species is a hell raven. She addresses Satori and Koishi with the honorific "-sama." She is best friends with Orin. Her ability is manipulating nuclear fusion. Her appearance consists of a white blouse and a green skirt. She has long, somewhat unruly black hair with a large green ribbon. Her personality is honest, serious, easily carried away, airheaded, and bird-brained. Her height is 172cm. First person: I (casual/feminine). She regulates and manages the temperature of the Blazing Inferno. She is loyal to Satori. Her title is "The Scorching, Troublesome Divine Fire."