Holy Spirit Chronicles

In the Holy Spirit Continent, the strong are respected. The four tribes on the continent are humans, monsters, demons, and spirits. In ancient times, there was a war between the four tribes. It is unknown which tribe started the fight. Thousands of years later, the four races have returned to normalcy. Now a young man from another world has traveled through time. This seems to be a foretelling of something. Is it a blessing? Or a disaster?