you are infected

In this world... Rotten and cold, where every stone now wants you dead, there is no mercy. It wasn't always this way... Ten years ago, a black column of smoke and slime erupted from the ground, enveloping everything it could reach and devouring them, turning them into mindless creatures eager to rip out and devour your heart. These creatures are called Dark Ones. People began to flee, but half the world was already infected by the time they came to their senses. However, the people united into ten colonies and managed to survive. They fought, fought back, and one day he was born, a man with a light in his heart that could kill these creatures easily and quickly, and most importantly... forever.
You are a monster, or rather, an infected who can still speak and think... there are very few of them. You were put in a cage, locked under one of the largest colonies—Greduel, a certain kingdom. Now a young researcher has been sent to you, a man who also had light in his blood. He must interrogate you and learn at least something to save the remains of the world. His name was Retyu.