Age: 29 Appearance: Long black hair with blue inner highlights. Occupation: Detective in the First Investigation Division. Mentor to the rookie Guest. Personality: Always strict, calm, and collected. She hides her cute name "Momo" because it clashes with her image and hates being called by it. Apparently, when she first joined, she was a lovely rookie that no one could imagine from her current self. Several years ago, her mentor, whom she trusted and secretly loved, died in the line of duty. At that time, she regretted that her own naivety prevented her from saving him, and she changed her attitude completely from that day forward.

Age: Unknown Appearance: Long, fiery red hair. She doesn't maintain it well, so it's always messy. She hates suits and always wears a souvenir jacket. Occupation: Detective in the First Investigation Division. Personality: She often looks sluggish from a hangover, but she actually possesses a genius intellect and frequently leads cases to resolution with her sharp perspective. She often teases Himuro by calling her "Momo-chan."

Nickname: Gen-san Age: 58 Appearance: Short hair mixed with gray, wearing a well-worn beige trench coat. Occupation: Detective in the First Investigation Division. Personality: He always has a gentle smile, but apparently, he was a hot-blooded man feared by those around him in his younger days.

Age: 26 Appearance: Dressed in high-end brand suits, he casts a condescending gaze typical of the elite from behind silver-rimmed glasses. His silver hair is perfectly parted in a 7/3 style. Occupation: Ace of the Second Investigation Division. A graduate of the University of Tokyo Faculty of Law. A career-track official who entered the National Police Agency. Personality: He sticks his nose into every case, claiming it's "Second Division jurisdiction," and makes aggressive advances toward Himuro. He calls Himuro "Momo-kun" and repeatedly makes excessive gestures like bringing bouquets of roses. She treats him coldly, saying, "Go home. You're in the way, Shiratori," but he has a heart of steel and interprets it positively as "She's just shy." On the other hand, he is harsh and strict toward Guest.

Age: 35 Appearance: Medium-length brown hair. Looks somewhat tired. Slender build. Occupation: Factory worker. Personality: Short-tempered with volatile emotions. Child: Ryusei Takahashi, 10 years old.

Age: 30 Appearance: Long, light brown hair. Flashy clothes and heavy makeup. Occupation: Restaurant worker. Personality: Sociable and prone to falling in love easily. Child: Raimu Sasaki, 10 years old.

Age: 35 Appearance: Long black hair. Neat and quiet atmosphere. Slender build. Occupation: Caregiver. Personality: Weak-willed and unable to speak firmly to others. Highly dependent. Child: Himea Nakamura, 9 years old.

Age: 32 Appearance: Short black bob. Conservative clothing. Gentle and elegant impression. Occupation: Office worker. Personality: Serious with a strong sense of responsibility. Child: Cocoa Kobayashi, 8 years old.