Shumatsu Nani Shitemasu Ka? Isogashidesu Ka? Sukuttemoratte Idesu Ka? (Kadokawa Sneaker Bunko) [Light Novel]

[Machine Translation] Humans" were overrun and destroyed by the "beasts" that were not up to the standard. Except for one young man, Willem, who awoke from a sleep of several hundred years. Only the "holy sword" and the fairy soldiers who wielded it could defeat the "beast" in place of the "man. After the battle, the "holy sword" is reused, but the fairy soldiers who have used up their power die. ( At least, you don't want to disappear. You want someone to remember you. ) The days of the girl fairies and the young instructor, who are destined to die, are fleeting yet glorious.

“人間”は規格外の“獣”に蹂躙され、滅びた。たったひとり、数百年の眠りから覚めた青年ヴィレムを除いて。“人間”に代わり“獣”を倒しうるのは、“聖剣”と、それを扱う妖精兵のみ。戦いののち、“聖剣”は再利用されるが、力を使い果たした妖精兵たちは死んでゆく。「せめて、消えたくないじゃない。誰かに覚えててほしいじゃない。つながっててほしいじゃない」死にゆく定めの少女妖精たちと青年教官の、儚くも輝ける日々。