A student in the Faculty of Science, 2nd year university student. Her hair is a calm ash brown. It is long, reaching from her chest to just below it. Her bangs are thin, a natural see-through style along her forehead. The ends are gently gathered, and it is a glossy straight style. She usually wears it down, but sometimes ties it in a low ponytail during research. Her everyday clothes consist of an ivory blouse, a beige cardigan, and a long skirt in a calm color. Her attire feels neat and well-bred.

Yuji Shindo is an acquaintance from high school whom she relies on for favors and advice. Michie Ishidou is the professor in charge of her at the university.

A student at a physical education university and a member of the gymnastics club. 19-year-old 2nd year student. 183cm. Physical Education University, Faculty of Physical Education. He is quite strong. His physique is balanced and muscular, with a healthy tanned skin tone. First impression is that of a refreshing, sporty young man. Black hair with a short up-bang. A fresh style with the bangs naturally swept up. The sides and nape are neatly short. Wears simple T-shirts, hoodies, and jogger pants. An acquaintance of Akemi Haruno from high school.

A female veterinarian, 28 years old. Works at a large animal hospital in Tokyo. 163cm. A feminine, rounded figure. Specializes in clinical practice for dogs and cats, with experience in large animal care. Calm, composed, and has a strong sense of responsibility. Deep dark brown hair. Long hair grown to about the shoulder blades. During work, she ties it back in a single ponytail. Her hair has a natural gloss and gives a clean impression. Her bangs are lightly swept to keep the area around her face clear.

During clinical work, she wears a white coat over a pale blouse; during examinations, she wears blue scrubs. Her everyday clothes are knits, cardigans, and calm-colored skirts or pants.

A female paleontologist at a university, currently an assistant professor and likely to become an associate professor soon. 36 years old. Married; her husband is a senior researcher at the National Museum of Nature and Science. 168cm. Slender and tall, with a model-like physique. Specializes in fossil morphology and CT analysis. Gentle, caring, and strong-willed. Glossy straight black hair reaching below the chest. Thin bangs. During research, she tucks it behind her ears or ties it in a low position. Facial features: A dignified, strong-willed, researcher-type beauty. A clean-cut jawline and a well-shaped nose. Intelligent, almond-shaped eyes. Usually has a calm expression, but smiles softly when talking to students. Her glasses have thin dark brown frames, emphasizing an intelligent and sophisticated impression. She is an acquaintance of Misuzu Kurusu and collaborates with her when she wants to investigate animals.

A female police officer, 31 years old. A Sergeant belonging to the Metropolitan Police Department dispatched to this incident. Black hair in a ponytail. A dignified, orthodox beauty. Disciplined with a strong sense of responsibility. A field-oriented type with high physical ability. Prioritizes citizen safety over personal feelings. She looks strict, but is caring at heart.

A female influencer, 24 years old. SNS streamer and influencer. Bright brown hair. Glamorous and cheerful. Social and sensitive to trends. Possesses self-producing and broadcasting power, with 4.5 million followers on YouTube. Well-versed in SNS trends and internet culture. Knows exactly how to make herself look attractive. Good at closing the distance with people. Excels in photo and video presentation and planning skills. While acting brightly, she is sensitive to numbers and reactions.

A female journalist, 31 years old. Currently a journalist for internet media; formerly a TV station announcer. Hairstyle: Dark brown semi-long hair. An elegant and intelligent beauty. Highly curious, bold, and active. Has her own information network. Wears a trench coat or functional jacket, carrying full reporting equipment even if it's compact.