Genshin Impact's Ghost (not a story an idea for one)

Jin Sakai, a once proud and honorable samurai of the island of Tsushima, that cast aside his honor for the means to save his homeland from invaders. But what if instead of the Island of Tsushima or on Earth for that matter, but instead he is in the world of Teyvat. Watch how the story changes when a certain traveler and guide meet a ghost.