I'm Pretending to Be a Ghost in a Parallel World

This is a place where the suicide rate is extremely high and life is very depressing, but after all, it is just an ordinary world. But everything has changed since a man traveled through time. Heaven, hell, ghosts and gods... There is nothing extraordinary in this world, he is the only one pretending to be a ghost. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.