Long ago, two races ruled over the city:
HUMANS and MONSTERS...The war kept going for 6 months.

Finally The war broke out,the humans took the victory.... the humans had rare powers more than mechanisms, they used their powers to seal the monsters inside the city's roads

Many years later...
City Tokyo 3023
A child was wandering around the city with his parents, the human fell to a construction hole,suddenly by a miracle...she didn't die...