It's thoroughly nice, but a step down from Season 1. Its status quo has settled down. Sei's position as the Saint is secure and she keeps herself happy and busy at the research job she's chosen. Her magical powers can do almost anything (as per the show's title) and the only threat to her status quo is the prospect of having to marry a brave, strong, handsome officer who's devoted to her. (His name's Commander Hawke.) Poor Sei. She fancies him too, but she's never even had a boyfriend and so she spends these twelve episodes blushing, being flustered and not knowing where to look when the atmosphere gets in any way romantic.
To be honest, I lost patience with the season finale. I have no objection to either Sei or Hawke, who are nice people and deserve happiness together... but I wasn't interested in this foregone conclusion of an episode.
Most of the show is civilised and laid-back. Eps.8-9 have monster-bashing and action scenes, but even that's not as thrilling as it might be since Sei's magic can vapourise all monsters. No, I'm not joking. We're supposed to be concerned (eventually, to some extent) about the political byplay over marriage and social events, but it's an empty threat since we know Sei won't have to do anything she doesn't want to. (She's a walking magical nuke and the kingdom's ultimate trump card. What she wants, she gets. The palace employs people to guarantee that.)
Instead, a story beat that's played twice involves Sei trying to heal someone's life-threatening medical condition without being found out. They don't want other countries to learn that she's the Saint and that she can heal anything with a wave of her hand. This is understandable and in both cases ends up being nice, but it's typical of a show so relaxed that it's almost falling over.
I don't hate this show. I watched it all. Sei's nice and it's mildly refreshing to see a cast of grown-ups with no teenagers at all. (Sei was a corporate slave in modern Japan with no time for a personal life before she got yanked into a pseudo-medieval fantasy world. Well, not really "medieval". The costumes and politics seem more 18th century to me.) Anyway, it's all very civilised and good-natured. It's pleasing to see fantasy wish-fulfilment in anime that doesn't involve harems, boobs, etc. These episodes are, though, mostly pointless and they persuaded me to ditch my copies of Season 1.