Krai has been on edge ever since realizing he accidentally released the Sitri Slime—a deadly creation that could bring the entire capital to ruin—and now the Explorers' Association is asking for his help investigating strange occurrences in and around the city. To make matters worse, Krai's thoughtless response escalates the situation into a national disaster. And to top it off, Sitri Smart, Alchemist of the Grieving Souls, returns amid the chaos.

With a devastating slime on the loose and an evil magic syndicate lurking in the shadows, can the Grievers save the capital from the unseen perils they've unleashed upon it?