Both isekai and iyashikei, this show is a nice 4 hour long movie about a girl summoned to another world to save it who ends up being one of two. There's not a lot happening in each episode, and no real antagonists, but there sure are a lot of pretty, pretty boys going out of their way to be nice to the main character.
Happily, the show avoids a lot of the dumber cliches that can weigh down these shows; the main character seems decently smart, and there's no "too dumb to clear up a misunderstanding" clogging up the plot, such as it is, other than the main romance.
All in all, a nice, well produced, slightly bland show. I enjoyed it, it made me smile and gave me some feels, but I'm sure it's not for everybody.