シナリオゲーの悪役魔術師に転生した件〜使えない主人公の代わりにピンチのヒロインたちを救ってたら全員ヤンデレ化したんだが〜 (Associated Names)

One day, I woke up to find that I had reincarnated as the villainous mage in an incredibly popular scenario game. Determined to avoid the bad ending at all costs, I threw myself into mastering magic with all my might. However, the protagonist, who was supposed to be the key figure, was utterly useless, and…