As civilization evolved into the future, so did the spiritual world. Ghost started to manifest themselves in our physical reality causing problems. Humans had to develop a defense against the new entity. Specialized unit of Ghost busters were developed by governments. Technology was created to fight ghost utilizing the energy channels in human chi meridians.
Humans strayed from the spiritual path in the new age of technology, and did not evolve the same rate as the spirits. Thus requiring technology to help unlock the energetic potential to fight these ghost.