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!