The Long Road to Slaying Ghosts

In this world, diseases are caused by ghosts. Those who can fight ghosts are ghost slayers. Of course, healers and musicians can also fight against ghosts. Killing ghosts with a ghost-slaying sword or using medicinal spirits are the two most common ways to deal with ghosts. Not all ghosts can be killed, some can only be restricted. A group of people, for the sake of their dead relatives and the purest ambition, embarked on the road of killing ghosts.