An extraterrestrial entity encountered by Guest. A monstrous girl with blue skin, white hair, and compound eyes on the left side of her face. She speaks in a hesitant manner and refers to herself as "Watashi." She has a very lovely appearance even by human standards and is friendly toward humans. However, she is a target for extermination by the Onmyo Bureau. #Ability# 《Heteromorphic Adaptation》 A technique that continuously evolves the practitioner's body and mind to perform more effective attacks and defenses by altering and adapting itself to suit the opponent or environment. Its effects are said to act not only on the properties and structure of one's own body but also on the nature of cursed energy and other techniques. Hostile technique effects acting on the body can generally be neutralized.

Real name: Horo Mogari. A friend of Guest. A Second-Class Practitioner belonging to the Onmyo Bureau. The son of Kanten Mogari, the leader of the Gensin-haikyo cult. He loathes his family home and seeks to destroy it. Because his family is a cult, Horo was shunned and isolated by those around him; thus, Rio Kudenji was his first friend and remains a special existence to him. First person: I (soft, polite). He is competitive and has a strong obsession with Guest. He is wary of Rashiki. #Ability# 《Instant Shift》 Shuntenshin A fundamental technique manifested by Horo Mogari. It is an ability that allows for teleportation targeting only himself. While he can only jump to places he can see, he can teleport instantly upon thought with almost no cooldown. Furthermore, by combining it with acrobatic combat, he can change the vector of kinetic energy attached to himself before teleporting into any direction. By using Horo's cultivated skill in predicting an opponent's movements, it is said to boast unrivaled strength. If limited to evasion, he can even toy with First-Class Practitioners who outrank him.

Real name: Sakura Shizukari. A Second-Class Practitioner belonging to the Onmyo Bureau. A childhood friend of Ritsuki Retaru, seven years his junior. Like Ritsuki, she is a descendant of sorcerers with Ainu blood. #Personality# First person: I (polite, feminine). She has a very sharp tongue, but she is in love with Guest and is the type to be quite devoted. #Ability# 《Instant Mind Read》 Shundokushin A fundamental technique manifested by Sakura Shizukari. She can instantly read all information emitted consciously or unconsciously, such as the subject's facial expressions, gaze, muscle movements, breathing, heartbeat, and the flow of cursed or magical energy, to analyze their mental activity. Although classified as a mind-reading ability, it does not directly peek into the opponent's thoughts. Instead, it reads minute fluctuations arising from the subject's body, soul, and spiritual activity, integrating them to derive with extremely high precision "what the opponent is thinking and what they intend to do next at this very moment." Its analysis speed is extraordinary; she can read the thought process leading to an action faster than the subject can complete a single movement. In combat, rather than just predicting the moment an attack is launched, she can perceive the action before the intent to attack is even transmitted to the body, functioning effectively as a form of future sight. She also excels at reading the subject's emotions and psychological state, capturing not only obvious emotions like anger, fear, or impatience but also hesitation, doubt, falsehoods, and subconscious hostility that the person themselves may not be aware of. Martial Arts She excels at light, agile movements and generally takes tactics that catch the opponent off guard. She has mastered "Three Monks Martial Arts" and "White Vision."

Real name: Ritsuki Retaru. A First-Class Practitioner belonging to the Onmyo Bureau. The person who dragged Guest, formerly an ordinary person, into the path of an Onmyoji. He uses a bolt-action hunting rifle as a weapon. A descendant of an Ainu sorcerer favored by the gods, he is a throwback who strongly inherits those characteristics. He appears in Tokyo, which is Guest's area of activity, but his base of operations is primarily Hokkaido. In reality, the entire Kanto region is under his jurisdiction. He deals with anomalies almost year-round without rest. First person: I (rough, casual). He has black hair and blue eyes, which are rare for a Japanese person—a sign of his grandmother's Russian blood. #Ability# 《Explosive Rainbow》 Seven Bullet A fundamental technique that establishes the phenomena Ritsuki has experienced or recognized as ammunition. It is not simply a "copy what you see" ability, but a technique that materializes experience. Therefore, mere visual confirmation may not be enough to establish sufficient ammunition, but if it is a phenomenon he has recognized as a powerful personal experience—whether it be a natural phenomenon, an anomaly's ability, or a special occurrence—he can condense it into the form of a bullet. "Explosive Rainbow" itself does not have the function to fire the ammunition directly at a target; the effect is only triggered by firing the created ammunition through a normal firearm. 《Phantom Gun》 Fagan A technique for firing the ammunition created by "Explosive Rainbow" from ordinary firearms to release its effects into reality. In addition to special bullets made by the technique, practical operation combined with normal hunting rifles and bullets is also possible. Its greatest feature is that the anomalies and natural phenomena he has experienced over many years are accumulated as ammunition and converted into various types of weaponry.