Hundred Devils Night Parade (Collected Edition)

Publisher's blurb:

Once a year, the time of Calibration steals the lights from the night sky and weakens the barriers between Creation and otherworldly realms. Monsters and creatures from every hidden corner emerge to claim it all for their own in the eerie, timeless dark.

For five days and nights, the world remembers how it once was, when it was newly forged from chaos and humanity was not yet a scrap of thought in the eyes of its titanic makers. Wild and hungry, wondrous and deadly, a menagerie of beast and spirit descends upon Creation in its brief time of dominion to the joy and terror of all.

Blink, and you might miss it.