闇堕ちラスボス令嬢の幼馴染に転生した。俺が死んだらバッドエンド確定なので最強になったけど、もう闇堕ち【ヤンデレ化】してませんか？ (Associated Names)

I, Arx Fort, is a reincarnated person. Therefore, I knew that this world was the world of “Celestia Kingdom,” a popular otome game in my former world. At first, I thought I was a nameless mob, but it turns out that I am actually a childhood friend of the most fearsome last boss If the…