action, adventure, alternative world, based on a light novel, comedy, dragons, ecchi, elf, fantasy, fantasy world, female harem, feudal warfare, harem, heterosexual, isekai, kuudere, large breasts, love triangle, magic, magic school, maids, marriage, master-servant relationship, military, novel, parallel universe, parallel world, person in a strange world, plot continuity, reluctant hero, romance, romantic comedy, school, school life, seinen, sequel, swordplay, swords & co, tsundere