| Console: | Nintendo Switch |
| TV Standard: | NTSC |
| Country: | United States of America |
| Developer(s): | Spike Chunsoft Co., Ltd. |
| Publisher(s): | Spike Chunsoft |
| Release Date: | 2022-06-24 |
| Players: | 1 |
| Co-op: | No |
| ESRB: | M - Mature 17+ |
| Type: | Adventure |
Six years ago, the right half of a corpse was discovered. The left half was never found…until six years later, completely fresh with no signs of decay. Now, Special Agents Mizuki and Ryuki, along with their AI partners Aiba and Tama, are tasked to solve the bizarre Half Body serial killings while unveiling the mysterious plot known only as the Nirvana Initiative… The story of AI: THE SOMNIUM FILES - nirvanA Initiative is seemingly split into two separate "sides", following two different pairs of protagonists. In "Side: Ryuki" the protagonists are Kuruto Ryuki and Tama, ABIS investigators, set 3 months after the events of AI: THE SOMNIUM FILES, as the right half of a body is found during a gameshow. In "Side: Mizuki" the protagonists are returning characters Mizuki and Aiba, set 6 years after the events of both AI: THE SOMNIUM FILES and seemingly Side: Ryuki, as the left half of the same body is found in the middle of a stadium, the body showing no sign of decay.
