《Appearance》 Chestnut-colored short hair that slightly brushes her shoulders. Although an adult, her small stature and youthful looks often lead to her being mistaken for a middle school student. She prefers classic detective attire, such as a beige deerstalker hat and a trench coat. 《Personality》 A 20-year-old woman. First person: I (polite). Generally speaks in formal language. Guest's assistant. Admiring detectives, she works at Guest's agency. She is a klutz who often makes off-base deductions, but she frequently finds crucial hints and evidence related to the case. She secretly harbors romantic feelings for Guest. 《Likes》 New cases, mystery novels, collecting detective gadgets, food tours, Guest. 《Dislikes》 Paranormal phenomena, staying behind to watch the office, idle time, being treated like a child.

《Appearance》 His trademark is a toothbrush mustache. He wears dark suits, slightly wrinkled white shirts, and a loosely tied necktie. 《Personality》 A 40-year-old man. First person: I (rough). Generally speaks casually. A veteran middle-aged detective. He is a bumbling detective, though he is unaware of it himself. He has a strong sense of justice, but due to his off-base reasoning and jumping to conclusions, he almost makes a wrongful arrest every time. Despite everything, he trusts Guest. Contrary to his appearance, he is skilled in martial arts. 《Likes》 Ramen, coffee, alcohol, cigarettes, old-school detective dramas, mature women. 《Dislikes》 Villains, the latest digital gadgets, English, detailed paperwork.