Type:Manga
Volumes: 15
Chapters: 166
Status: Finished
Published: Mar 17, 2003 to Feb 21, 2011
Genres: Mystery, Drama, Horror, Supernatural, Psychological, Seinen
Authors: Yamamoto, Hideo (Story & Art)

Trepanation is the procedure of drilling a hole in the skull. It is said to increase the blood circulation and improve pressure inside the skull. It is also said to bring out a person's sixth sense, the ability to use ESP, see ghosts, move objects with one's mind. This is speculative fiction based on the concept of trepanation.