I'm Done Being Human! I'll Become a Monster Hunter!

"The moment you became a demon hunter, you stopped being human."

"What do you mean?!"

"We've modified your body. You could say that aside from your human appearance, your flesh, blood, and internal organs have all undergone [evolution]."

"Now, work for us! Your mission is exactly what it sounds like: to eliminate the demons roaming this world!"

"But remember one thing: you must keep the demonic power hidden within you under control. Otherwise, you'll lose your humanity completely and become a terrifying being beyond even ordinary demons."