The Saint's Magic Power Is Omnipotent [English] S1-S2

Sei, a 20-year-old officer worker, is whisked away to a world of magic. Extraordinarily, the Saint summoning ritual brings two people instead of one, but the kingdom's young prince eliminates the confusion by nearly instantly declaring the other girl to be the Saint. That leaves Sei on the sidelines, pretty much left to herself. Some two weeks later when strolling in the garden she stumbles upon a researcher from Medicinal Flora Research Institute. After a short talk he invites her on a tour. Having prior interest in herbs she shortly joins the institution, where some irregularities in her magic powers start to come to light...