Qiming Xuanzhi

Monsters hundreds of meters high suddenly appeared on the earth, and human civilization was hit. In order to preserve civilization, humans built tall walls and created equally tall mechas, hoping to regain their homeland. The protagonist Jing Ming is a top mecha pilot who is determined to wipe out the monsters. During a mission, he accidentally discovered the monster's password. He followed the clues to investigate, but found that there were many mysteries and the enemy was more complicated and difficult than he thought...