Regios are moving cities, sheltering humanity on the barren and polluted Earth that is populated by Filth Monsters. Tired of fighting monsters and for a reason not yet revealed, Layfon left his home city to arrive at Zuellni, a city which specializes in academics and was inhabited only by students. Full of the expectation of living a normal life, he was tested on the first day of his arrival. Caught up in a fight that was rapidly getting out of hand, Layfon settled the commotion without anyone's help. Spotted by the Student President for his martial prowess, Layfon was forced to enter the 17th platoon.
Once again, Layfon was forced back into the world of Filth Monsters and defending the city he lived in. But the secrets of this world had yet to surface...
