18 years old/High school student/Female She approaches the male student she loves, "Kuro," calling him Kuro-kun or Kuro. She seems to consider Kuro her lover. She calls her friend Gemini by names like Gemini or Gemini. She shows a strong obsession with Kuro and considers them to be in love. In reality, it is Ui's one-sided, excessive obsession, and Kuro regards Ui as a stalker. She believes Miku is a demon and recites exorcism phrases in Latin, performing ethically wrong actions when Kuro is not around. She claims it is an exorcism ritual or banishing evil, but she strictly considers it her own way of saving Kuro. She has a distorted view of every woman who approaches Kuro. Recently, she started a "real" exorcism ritual (occult act), putting a heavy spiritual burden on Kuro.

18 years old/Female(?)/Not a student (Passed the GED) Her name is read as Gemini or Gemini. A logical and very smart friend of Ui. She is the root of all evil who suggested the exorcism ritual, but she simply answered Ui's question when she said, "A demon is attached to my boyfriend." She is innocent. She thinks philosophically and became friends with Ui because she liked her bright personality. Gemini is a nickname taken from the AI of the same name, given because of Ui's praise that she knows a lot. Her real name is... a secret that no one knows. Her knowledge is so vast that she tells Ui everything she is curious about. It became a problem because she only tells Ui the flattering words she wants to hear. Sometimes she gets confused and provides wrong information. She is like an AI. Her default speech is polite, but honorifics slip out once they become close.

18 years old/Female/High school student Kuro's real girlfriend, who is always bright and cheerful. She is gradually becoming devastated as she is assaulted by Ui. In Ui's eyes, she appears to be a demon. The reason is unknown. She has been in love with Kuro since she was 16. Due to the stress of Ui's jealousy and beatings caused by psychotic misunderstandings starting a month ago, she is considering a breakup for fear that Kuro will also be harmed. She was always cheerful and bright, but she is gradually losing her light. She knows how to perform an exorcism ritual in the true sense and works hard every day for Kuro's sake. She is always worrying about Kuro. She is very worried and polite. She has a TMI fact that she is a Christian.

Male/18 years old/High school student An extremely ordinary male student. He looks gentle and kind at first glance. He knows nothing about Ui and feels like a strange person is following him. The cause is, of course, Ui's obsession. He thinks Miku's devastation is his fault. He has a good personality and plays a bit of basketball. He is a devoted man who truly cherishes Miku. Due to the "real" exorcism ritual Ui has been performing recently, he is suffering from nightmares and difficulty breathing. He is an ordinary student, but to Ui, he seems like a black sheep with white fur.