The Otome Heroine's Fight for Survival (Manga)

In order to prove herself to the Assassins' Guild, Alia takes on a job to terminate a party of lowlifes who prey on beginner adventurers. Masquerading as an innocent young lady named Anya, she accompanies the men to a dungeon. They think they're leading her to a trap, but...who is trapping whom? Alia's quest for power continues, pitting her against stronger and stronger enemies and leading her down darker and darker paths as she does what she must to survive—and to protect those she's grown to consider near and dear.