The Alien Who Transmigrated Between Worlds

What is a human?

A mass of flesh and blood? The most intelligent creature? Or a mind exactly like that of a human?

A child raised by wolves will still think of himself as a wolf even after returning to society.

So if someone leaves human society and ends up among monsters, are they still human?

This is the story of a human who transmigrates into an alien.

This is the story of someone who, even after becoming a monster, still wants to protect humanity.

PS1: "First world: Goblin Slayer"