| Tomonaga Mio | |
 | |
| Series: | Joshikou Keisatsu |
| First Appearance: | File 1: Mystery Case at the love hotel-Chu! |
| Last Appearance: | TBA |
| Number of Episode Appearances: |
TBA |
| Actor: | Tomonaga Mio |
| ' | |
Tomonaga Mio (朝長美桜?) is a High School Detective in the Joshikou Keisatsu series. She has two police pin-badges, one is placed at the tip of her seifuku ribbon, while the other one is at her hairband. She is portrayed by HKT48's Tomonaga Mio.