The Branded Swordswoman summary:

There was a time when mages were feared. In the Kingdom of Fulgund a female spellsword called Alfiris travels in hope to become a "person who can save others". However, those who manipulate magic are shunned even by the mercenary guild. If one day she finds a travel companion and her "curse brand" is seen... When one day she is reunited with Sister Anorn, a drunk who considers her a "friend", and gathers other companions to slay an archfiend― When overwhelming despair strikes them, Alfiris's right arm bursts into flames and a different persona emerges!