If you're looking for manga similar to Because I, the True Saint, was Banished, that Country is Done For! (Light Novel), you might like these titles.
After his pet died, Yamagata Tatsumi lost his will to live and spent everyday meaninglessly. But since her death, every night he dreamed about a girl praying inside a room made of stone. 10 days passed and he reminiscences about the bird while playing with his acoustic guitar the song they used to sing together. Then suddenly the area around his bed began to shine, and the scenery around him changed. He was still on his bed, but the room turned into the one from his dreams, and the girl was there. The girl was teary eyed and then jumped upon and embraced him. The girl, Holy Woman Calzedonia, smiled brightly and said “Finally… finally we meet again, master… I am your pet…. Chiiko!”
In the land of Reveur there exists a legend of the Silver Siren—a monstrous being who with words alone can topple entire civilizations. People have long learned the legend, to fear those with silver hair, and to flee from those who dare mutter the words of Song! Meet Kanon, a shy everyday high school student preparing for her graduation day with a final tour of her school. Singing a mysterious sheet music she found in the school music room sends her to a fantastic alternate world of adventure, cursed Sorcerers, war-torn lands, monsters, and skilled mercenaries. But she soon learns that in this strange new world of magic and swordplay, she is perhaps the greatest threat of all. Will Kanon survive in this fantasy world where people view her as a nightmare made reality? Let the Song begin, for nothing else will save her…!
He lost his new home and all his property, but found a cute girl! Harold, a poor laborer who saved for years, finally obtained the house of his dreams, only to lose it to a fire the very same day. Feeling like nothing mattered anymore, Harold finds himself at an auction, where he ends up spending all of his savings on a slave, Atie... Harold, with his secret technique, and Atie, with her skills as an adventurer, begin their freewheeling journey now!