This show is kinda bad.

First, the upsides:

1. Gorgeous visuals. The art and animation is a sight to behold. With each frame looking like it was right out of a children's storybook, it's hard to believe that this show is digitally animated. It's as if it's halfway between digital and cel animation. The line art is immaculate; you can just feel the pencilness of every frame. And with the watercolor-style flashbacks I felt like I was pausing every 5 seconds just to drink it all in. Like, Hiling's dress in episode 3 is simply to die for. And it's not just the art itself - the shot composition is awesome. As just one example, there is a scene in episode 7 where Bojji sees his father reflected in an axe on the wall, and it's just a great shot. Interesting shots like these are scattered throughout the whole series, making it never dull to look at. The visuals carry Ousama Ranking hard.
2. An amazing second OP, ranking among my top OPs ever. Hadaka no Yuusha is a banger of a song and it is accompanied by powerful imagery animated in the aforementioned gorgeous style, and edited immaculately. Seriously, it's amazing. Up there with other all-timers like the FMA:B openings.
3. An extremely promising first half. Ousama Ranking sets up a fantasy world that is somehow both whimsical and grounded, with mysteries to be solved and a unique pair of protagonists you want to root for.

Now, the downsides, or, rather, the downside, singular: This show craps the bed in the second half. But not anywhere close to a funny, Charlotte-style trainwreck, it just fails to deliver on anything it has set up. It is boring, boring, boring, boring, boring. The majority of the second half is a castle raid that another review aptly compares to the Chimera Ant arc of Hunter x Hunter. But unlike the Chimera Ant arc, which makes sense for the most part, Ousama Ranking's raid is nonsensical, with unclear character motivations, party loyalties constantly changing at the drop of a hat, tedious backstory loredumps, everybody sobbing constantly, and boring-ass fights. The intrigue from the first half is followed up on, but in a very unsatisfying way. I stopped caring in the slightest what happened to any of the characters. Everything drags and drags and drags, and when it finally ends the ending is boring too. The second half (or so) of this show was so tedious to get through that it has completely eclipsed any positive feelings I had toward the first half. I would rather have read 10 cookie cutter isekai power fantasy manga back-to-back than engage with this. Jesus Christ.

My recommendation: Avoid completely, because the first half will probably suck you in and make you feel obligated to finish, like I was. Not worth your valuable time.