Joushou Maou no Yarinaoshi

Five hundred years have passed since Sieg, considered the most powerful demon lord, was defeated by a legendary heroine. The adventurers' guild remains devoted to the hero's descendants due to their bloodline. Aru, a low-level adventurer, is tricked by one of these heroes and acquires a cursed blade to aid his companion Yuuna. The blade contains Sieg's full power, and Aru is recognized as Sieg's reincarnation. Now possessing immense strength, Aru embarks on a journey with a group of female companions to confront the corrupt hero. The story is based on a web novel.