Shaman manga

Shaman summary:

Deadly chemicals, lab rats, mutations to the genes and a mysterious case of death. Shamans--the people who can see and treat the dead. One of them often spies a girl--the girl his step-brother choked to death. ~~~~~~~~~~~~ There is a village with a powerful shaman family. The Shaman-either white : balancing out life and eliminating darkness by spells, or black : feeding on the power of other darkness. Johwi has been in a conflict with himself ever since that "incident." Scarred by his past, he has been living his life avoiding anything to do with spiritual powers.Despising his own shaman powers he was born with(a medium), he tries to live life as a normal person...until he finally has to come to a decision of whether or not to face reality.And his decision of whether or not to break the seal that has controlled his mysterious power so far, with the risk of knowing that it is uncontrollable...and might take away more lives than necessary...Can Johwi overcome his inner demons?