(Revival of spiritual energy, cool male protagonist, spiritual beast, no harem)
I just finished saving the world, why am I no longer a human being, and why are all the people from other worlds coming to earth?
Witch: Even if you are no longer a human being, do you think I won't recognize you? You have taken away my innocence and you are bound to die in my hands!
Imperial Princess: Brother Brave, no matter what you become, you will always be you. Do you still remember that I said I would marry you ten years ago!
Cat-Ear Girl: Long time no see. Why are you rejecting me now that we are no longer human?
…
From now on, I am no longer a human being or a hero. I am the devil, and I want to destroy the world! No one can stop it!
