She Professed Herself Pupil of the Wise Man (Light Novel) Vol. 17

Tasked by Queen Alma of Nirvana to protect the oracle, Mira ends up moving in with the girl. But the evil forces of Ira Muerte aren't about to sit back and let the oracle keep hampering their criminal goals! When the very castle itself is infiltrated by a mysterious figure seeking to silence a captive before they can spill the beans, chaos ensues, and Mira must jump into action to neutralize the threat.