Through the World Door
Saito Hiraga, the Gandalfr, has finally returned to his homeworld of Earth after a year of trials, suffering, and enslavement in the land of magic and monsters, Halkeginia. But even on Earth, he is not safe from the supernatural. And even on Earth, he may just find himself bound by the chains of servitude once more...
Rated: Fiction M - English - Supernatural/Drama - Saito - Chapters: 4 - Words: 121,417 - Reviews: 292 - Favs: 699 - Follows: 698 - Updated: Jul 6 - Published: Apr 27 - id: 10305032
Main point of the story is that after Saito had his mind cleared in Halkeginia he didn't just go back to Louise with open hands, but started doubting everything that happened to him so far, his feelings, his allegiances, everything, so much that in the end he ends up as he is at the start of this fanfic.
Raynare is a proper psychopath in this one.