The Labyrinth, an abyss so deep not even the eye of god can pierce through to its very bottom. Hundreds and thousands of adventurers brave its tunnels, and are slain; people have yet to tread anywhere near its end, great unknown that it is. One girl, Chino, must, with the aid of _Constructs_, treasures from the labyrinth housing something akin to life inside their forms, challenge and survive its depths in order to save her sister, who is being slowly eaten away by a curse. But is what awaits her at the bottom of the labyrinth hope? Or despair?