Rainman

Taki Amamiya is notified of the sudden suicide of his twin that he never even knew existed. But to Amamiya, who works reluctantly at the Parapsychology Research Institute, it was only the prelude to a more shocking chain of events. After following the recommendation from police to investigate the matter more in depth, they found a surprising fact: Amamiya had no brain. Now fear the world of the psychic and supernatural.

(Source: ANN)