The Beginning Is a Big Monster

There was a big demon who was very miserable. He was captured alive, the demon pill was taken out, the demon soul was destroyed, and he lost his mind. He was also controlled by someone and turned into a killing puppet. So miserable~ Protagonist: "I traveled through time and turned into a monster and was controlled by someone. I'm panicked! What should I do?" "I heard that people in this world are very bad-tempered and will stab monsters whenever they meet. Monsters have no human rights and will either be dissected or enslaved. Alas~" "I want to work hard to survive, I want to become stronger, and I want to reach the peak of the demon body~"