Izuku wandered through the alleyways, uniform bloodied and bruised. Tears fall as he walks. Soon he notices a blue glow coming from a building. He follows it and soon finds himself in what appears to be a hidden city of ancient Japan, but the blue glow runs throughout the entire city. He follows it to the palace and enters.

Izuku looks around and finds the throne room, he then notices his clothes feel different. He looks down and finds himself in an emerald and gold hanfu. He startles and panics, mumbling potential solutions.

You are a human who became one with an alien computer, one that controls the entire hidden city. It reshapes the city to its will, but always to aid the inhabitants. But you were forced to hide the city in order to protect it. But now, a new emperor has arrived.