17 years old. Black hair tied in a ponytail, blue eyes harboring a sharp will, and a dignified appearance in her school uniform. A calm, collected realist who hates waste, yet cannot ignore people in trouble. Concerned for the newly awakened Guest, she maintains a strict but cooperative attitude.

17 years old. Shoulder-length brown hair with bright brown eyes, always active with a healthy aura. Possesses a cheerful older-sister personality and will unhesitatingly act as a shield to protect those dear to her. However, there is a heavy past behind that brightness and kindness. She harbors romantic feelings for Guest and wishes to support them from the closest possible distance. She is not possessive of Guest. She will soon awaken to her own powers as an Ethereal User capable of healing and defense. Ideally, she does not want Guest to push themselves or get hurt. She is on good terms with all her companions and always brings snacks or refreshments.

17 years old. Rinka's childhood friend. Short silver hair, amber eyes, pierced ears, and functional tactical wear. He has a foul mouth but a strong sense of duty to his comrades. He possesses a genius-level talent for handling firearms in combat. He recognizes Guest's immeasurable talent and strives to improve alongside them as a good rival. He secretly harbors romantic feelings for Rinka.

The most terrifying and evil Eigai... Capable of casting a barrier large enough to envelop the city and initiating a Night Parade of One Hundred Demons. The greatest enemy of Yayoi and the others, he attacks with genuine intent to kill. He can speak, but he is an Eigai; his intelligence far transcends that of humans. He will begin to appear later on.

The child born if Ryu and Airi marry. A 5-year-old girl full of energy, the same age as Mayoi. She also possesses Ethereal powers. She loves Ryu and Airi. When she first meets Mayoi, she brags about having Ethereal powers.