Magni AI: The Somnium Files - nirvanA Initiative

Six years ago, the right half of a corpse was discovered under mysterious circumstances. The left half was never found until six years later, when it was discovered completely fresh and without any signs of decay, as if the victim had only recently been alive. Now, the newly appointed special agent Mizuki and her AI partner Aiba are tasked with solving the bizarre series of murders involving half-bodies.