Deep beneath the earth lies a world where reason itself is distorted.
Gravity runs wild, and life descends into abominable, monstrous forms.
Once you set foot within it, you are consumed by an eternal abyss—its name is the Maze.

An amnesiac Commander, and girls chosen by fate.
Still, they head into the Maze.

Bound by a curse called hope.
But they do not yet know:
that this world, too, is an abyss;
and that this world itself is the answer to a distant “question”—

A vast academy city that is more than just an educational institution, where talents from every field—academics, arts, sports, and more—gather.
With residential districts, commercial areas, and even factory zones, it has the capacity for independent self-governance.
At its heart lies the Pilot Department—a place where challengers to the underground world known as the Maze gather.

A mysterious and gigantic space spreading beneath ZAR'TUM Island.
Even today, its full scale remains almost entirely unrevealed.
The interior is filled with countless unknown threats triggered by gravitational anomalies, and the origin of its birth is also shrouded in layers of mystery.
At the same time, this is also a treasure land where an unknown resource of supreme value lies sleeping—the "Tatumiya ore".

A giant humanoid machine: the Maze Guarder—commonly known as MG (Maze Guarder).
Developed for mining Tatsumiya Ore, this machine has the high mobility needed to adapt to the complex terrain of the Maze.
It is also equipped to counter unknown threats, allowing it to handle a wide range of situations within the Maze.