AI: The Somnium Files Series

Six years ago, the right half of a corpse was discovered under mysterious circumstances. The left half was never found...until now, when it is discovered completely fresh with no signs of decay, as though the victim was alive until just recently. Now, newly-appointed Special Agent Mizuki and her AI partner Aiba are tasked to solve the bizarre Half Body serial killings.

One rainy night in November, a woman's body is found at an abandoned theme park, mounted on a merry-go-round horse. She had been stabbed repeatedly, and her left eye was gouged out. Kaname Date of the Metropolitan Police Department arrives on the scene. He recognizes the woman. Suddenly, he hears a noise from inside the merry-go-round. He breaks into the merry-go-round's central column to find a young girl. And in her hands, she grips a bloody ice pick...