Livid Lady's Guide to Getting Even: How I Crushed My Homeland with My Mighty Grimoires (Manga) Volume 6

After returning to the imperial capital with Misha, Ellie discovers a mysterious epidemic plaguing the city. The crown prince, Okyst, summons her and tasks her with retrieving the key for the cure, emaya ore, from a dungeon. With Mireille and Lunoa afflicted, Ellie can't possibly refuse. She immediately leaves for Dold alongside Elsa, the leader of Sharp Edge, and Yuuka Kusunoki, a Rank A adventurer and famous doctor. After running into Tida and luring her into the party with a convenient bribe, our heroines enter the dungeon-only to discover something strange is afoot...