Short synopsis. Guy gets reincarnated (I think) into a sword and magic world. Learns magic from a young age and one day meets an elf, I think her name was Fia. He was too young and the elf had to go back to her home, but they promised to meet again after 10 or so years. Boy goes adventuring later and a harem is built, and I think he goes to a town that has a battle tournament and unexpectedly meets the elf again. Elf ran away from home because she was being married off to a high elf but wanted to be with the MC. Can't remember anything else. Thank you~