| Kasai Tomomi | |
| Series: | AKB48 Murder Mystery |
| First Appearance: | File 5 |
| Last Appearance: | File 5 |
| Number of Episode Appearances: |
2 (File 5, Testimony File) |
| Actor: | Kasai Tomomi |
| Chiyuu's Testimony | |
 | |
- "That… suit of armor at the scene of the crime? The armor and helmet? I feel like I’ve seen it somewhere before. In the recording of the program, it was like someone was wearing it… Or someone wasn’t wearing it… If I’m wrong, sorry."
- ―Kasai Tomomi's Testimony[src]
Kasai Tomomi (河西智美?), nicknamed Tomo (とも?), Tomo~mi (とも〜み?), Tomo~michan (とも〜みちゃん?), and Chiyuu (チユウ?); is a member of the AKB48's Team B. She is based on and portrayed by Kasai Tomomi.