Kodansha released two CD books in 1996 and 1997 respectively. Both have been made into anime. However, nearly all CD books voice actors are not the same as those in the anime version.
CD Book list
| Number | Case Name | Anime Adaptation | Live-Action Adaptation |
|---|---|---|---|
| 1 | Devil Suite Murder Case | Yes | Yes |
| 2 | Death God Hospital Murder Case | Yes | No |