Dungeon investigators investigate dungeons. Typically, they just document the ecosystem, make maps, and measure the ambient mana. This is the job that Expert-class investigator Sly Abbot takes pride in. But this current dungeon investigation seems a bit weird. Especially his partner, Runa Smith, who seems exponentially stronger than he is.

Clearing the dungeon is easy. However, when the conditions are just right, mana stagnates within a dungeon. And when enough mana builds up...

...the veil collapses.