I'm Really Bragging, Please Don't Believe Me.

The dimensional wall bursts, evil tribes descend, and once-mythical monsters appear one after another. In order to face invaders from outside the territory, the world urgently launched a genetic modification project. In the face of the transformed third human beings, foreign invaders are vulnerable to attack. Five protection circles have been established. Humanity has also ushered in peace and is developing towards a higher dimension. Suddenly one day, a young man who came out of the mental hospital suddenly said: "Peace is just an illusion. This world has long been infiltrated by demons." People don't believe him, but he talks nonsense every day. Until one day: "The underground waterway is really the base camp of demons." "This world is really a demon disguised." "The protective circle really broke after three days." "Who is this man?! How come he knows everything." It wasn't until one day what he said came true that people realized the gene sequence [ ] - the terror of Lord Shadow. But he just said calmly: I'm just bragging, please don't believe it!