The Mysterious Abyss: the Fateful Reincarnation of Multiple Personalities

A mysterious world that combines steampunk and Cthulhu elements - "Eisen City". Technology and mysterious forces are intertwined, and there are ancient sects, secret organizations and unspeakable horrors. The protagonist has a split personality due to witnessing a murder in his childhood and the mental abuse of his fake parents, and is involved in a fateful conspiracy that spans time and space.