The Saint's Magic Power Is Omnipotent (Manga) Vol. 6 (manga)

Once a humble office worker, Sei is now the Holy Saint of the Kingdom of Salutania, key to driving back the evil miasma that threatens its lands. What she enjoys most, however, are her peaceful days in the capital city working as a potionmaker. After helping to purify the forest near the capital, Sei hoped those days might return...but her reprieve is short-lived.

A sudden acute shortage of potion ingredients sees her joining the knights of the realm on a journey to the Klausner Domain, rumored to be the home of secret potions found nowhere else!Series Overview: Sei, a 20-year-old office worker, is whisked away to a whole new world. Unfortunately for Sei, the ritual that summoned her--meant to produce a 'Saint' who would banish the dark magic--brought two people over instead of one. And everyone prefers the second girl over Sei?! But this is just fine by Sei, who leaves the royal palace to set up shop making potions and cosmetics with her newfound magic.

Business is booming, and this might not be such a bad life, after all...as long as her supposed Sainthood doesn't come back to haunt her.