This anime has both pros and cons. The storyline was really good, and the main character was refreshing, but there were a few annoying things about Olivia and Leon in addition to a plot hole regarding the Principality. In the end, it's still a good anime.
When I rate an anime, I take five categories into consideration: sound/music, visuals, characters, story, and ending. The sound, visuals, opening, and ending are either good or really good in this anime.
Leon is the main character of this anime and at first, he was refreshing over the normal bland Isekai protagonists.
Spoiler, click to view
At first, he was no more than a mob character, but over the anime his power and influence greatly changes while his perception of himself doesn't. I don't have a problem with him perceiving himself this way if he had a lack of confidence, but throughout the whole anime he almost never has any moments without confidence. The only two times he doesn't display confidence is during his tea times and with the climax of the conflict between him and Olivia. For some reason, he is overly confident to the point of arrogance in every other matter which makes it unbelievable that he would perceive himself as a mob character. This bothers me a bit, but he's still enjoyable to watch when he's not calling himself a mob character.
Angelica is a well-written character.
Spoiler, click to view
I don't blame her for failing to deal with Olivia properly.
Olivia is an odd character because her lack of confidence and trust in her friends is believable, but annoying.
Spoiler, click to view
It's only annoying because of the way Angelica and Leon fail to deal with her, and I believe this annoyance is good for the show and not a con. I don't really like her voice, but that's an entirely subjective opinion and doesn't factor into my score.
The princes are well-written as well, and they make a good rival for Leon even if they never will stand a chance against him.
Spoiler, click to view
I don't know how to feel about Marie because she isn't fleshed out enough for this season. She'll probably get more attention in the next season, but I wish they had dealt with her more than Olivia.
I won't talk about the remaining side characters, but they are all static and either flat or round depending on their screen time.
The story of this anime is really good for the most part.
Spoiler, click to view
The first arc revolving around the prince's breakup with Angelica and the small biker bit with a different prince were both really well done. The thieves' arc wasn't the best due to the lack of reasoning for both Carla and Stephanie. Carla did it because she was ordered to, and Stephanie's reasoning was just because of pure evil. I don't accept pure evil as an excuse for actions to this degree. I accept her bullying of Olivia because it's a way to get to Angelica, who has more power than Stephanie causing her to become jealous. The last arc is the Principality's declaration of war. I'll give Leon the victory due to his overpowered equipment, surprise factor, and arrogance of the enemies, but I don't see why the Principality invaded in the first place. They touched on this briefly, but they didn't answer the question. Perhaps they acquired the monster controlling flute earlier than expected? Anyways, the story is still really entertaining.
The ending was pretty good.
Spoiler, click to view
It didn't fix the principality plot hole or settle the mob character problem, but it did wrap everything else up. Despite all the cons, this show was definitely better than expected, and, although I'm just a mob reviewer with no importance, I want a season two.