I'm writing this from a hotel room at a con.

Sei is a burnt out office worker who suddenly gets summoned to another world in a summoning ceremony, the summoning of a Saint that will save the world of Salutania from a growing plague of monsters.
Sei however is summoned alongside a younger girl; the Prince ignores Sei and declares Aira, the other girl as the Saint.
With no way back along with the Kingdom having impeccable manners, Sei stays and goes into medicinal floral research where her high work ethic and affinity for healing magic makes her a vital part of the research team, but when she saves Captain Albert Hawke and his soldiers from near death and career ending injuries with miracle healing, it becomes more apparent that Sei is really the Saint.
This had the potential to go downhill pretty fast but ends up becoming a nice change of pace for an Isekai by being more focussed on the Slice of Life elements and letting Sei discover her powers carefully on her own, at no point does the anime feel like it's going to take any bad turns, even if Captain Hawke's army are pretty weak and even when Prince Kyle tries to weasel his way out of his mistake.
The ending however is a cheap cop out as it does rob Sei of some of her character.
The dub is really good though especially Celeste Perez who gives a fantastic Sei.
Final Verdict: A charming isekai for those sick of the usual tropes but the ending does feel like a cop out.