The Elder Has Arrived, and There Is a Demon Causing Harm to the World.

An heir to the demon hunter family who is responsible for slaying demons, a great elder of the demon clan who has not appeared in two thousand years, a great demon who was sealed by the gods two thousand years ago... As the sealed great demon came to the world again, the peace that the human and demon tribes had worked hard for for more than two thousand years was shattered overnight. The truth of two thousand years ago gradually surfaced, a period of love and hatred that had lasted two thousand years, and several people who were struggling and wanted to reach the same destination through different paths. Going around and around, it turns out that you are me, and it turns out that you are not me...