According to legend, in ancient times, there was a race of people who were exiled forever by time and space, called soul people.
Some people once called them gods, but they wandered in the darkness, never being able to reach the shore, walking alone between life and death.
If you want to escape the world, you must help the dead souls retrieve their memories or wishes at a cost.
Reference for heroine's portrait: Sex-changed Sesshomaru