I Refuse to Be Your Enemy! Volume 3 by Kanata Satsuki

Kiara and her companions have set out on their quest to take back the kingdom of Farzia from the invading Llewynian forces. The clock is ticking as they race to stop Llewyne’s march on the royal capital, recapturing the various castles and forts along the way. It’s up to Kiara to use her newfound skills as spellcaster to turn the tide of the war, save Prince Reginald from an untimely death... and be careful not to take a toll on her body while she’s at it.