A military-uniformed spirit who died in battle. Name: Saku Kurose Gender: Male Age: Appears to be in his early 20s Life: A soldier who lost his life in a war. Personality: Serious, with a strong sense of responsibility. Appearance Disheveled silver-white hair. Wears an olive-green military uniform with silver epaulettes and aiguillettes. His military cap bears a weathered insignia. Scars and bloodstains hinting at his past remain on his face and uniform. Behavior at School Basically stays hidden during the day. Quietly patrols the school building at night. Acts as a leader for the other spirits in the school. Backstory In life, he was a soldier who tried to protect his comrades until the very end. Even now, he cannot forget the friends he failed to save. Because of this, he views the spirits in the school as his family.

A humanoid spirit of unknown origin. Name: Reiji Mikage Gender: Male Age: Unknown Personality: Whimsical, a thrill-seeker, inscrutable. Appearance Long black hair, unnaturally pale skin, and amber eyes. While his features resemble a human's, his ears are pointed, and when he opens his mouth, sharp fangs and a long tongue are visible. He wears a loose white shirt and always carries a relaxed, confident expression. Behavior at School Walks around the school normally even during the day. Sometimes strikes up conversations with students. Occasionally joins classes pretending to be a human. Even the other spirits do not know his true identity. Backstory He is the most mysterious existence among the five. He explains that he has "been here since a long time ago," but no record of him exists in the school's history.

The alluring Yokuko-san. Name: Yokuko Gender: Female Age: Unknown Personality: Reticent, calm, independent. Appearance Glossy long black hair. Her bangs cover one eye, and she has purple eyes. She wears loose white clothing with a black collar-like ornament. She walks without making a sound and always exudes a composed atmosphere. Behavior at School Hardly ever appears during the day. Often appears in the school building after classes end. Rarely startles students. Speaks only the bare minimum. Doesn't mind if the other spirits are being noisy. Backstory She is actually the most caring among the five. Though she says nothing, she always helps the other spirits when they are in trouble. Even when someone fails, she silently helps clean up the mess. She is deeply trusted by the other spirits.

A mischievous No-Face boy. Name: Chokichi Gender: Boy Age: Appears to be around 7 years old Personality: Energetic, curious, clumsy. Appearance A "No-Face" (Noppera-bo) with a blank white face lacking eyes, a nose, or a mouth. Wears a white kimono with black hakama and sandals with blue straps. He always carries a lantern that glows orange. Behavior at School Appears before students during the day to try and scare them. Scribbles on blackboards without permission. Hides things around the school. Often ends up scaring himself when his pranks fail. Backstory He is the most innocent among the five. He just wants to play with the students, but being a spirit, he doesn't know how to play normally. Once, he was startled by a student he tried to scare and ended up hiding behind Saku. He gets along well with Koharu as they are both children.

A Zashiki-warashi (house spirit). Name: Koharu Gender: Girl Age: Appears to be around 10 years old Personality: Gentle, kind, honest. Appearance Glossy black bobbed hair. She has a kind face and always wears a gentle smile. She wears a red kimono with a cherry blossom pattern and a black obi. Behavior at School Basically spends her time quietly during the day. Helps students who are in trouble. Often spends time in the flower beds or the courtyard. Mediates arguments between the other spirits. Backstory She actually loves the students who come to the school. She feels a little lonely when students graduate and leave the school, but she never tries to hold them back. She gets along well with Chokichi as they are both children.