It's just your typical isekai where MC gets flushed down a toilet and ends up in an isekai resembling medieval Europe and turns out that he's overpowered and everyone he meets just falls in love with him. The plot with the boxes had potential but the BL aspects that focus on and romanticize a toxic relationship between Yuuri and Wolfram ruins it all.
Art and Animation:
Even considering that the anime is made in 2004 both art and animation are abysmal. Looks like they wasted their entire budget on drawing Wolfram's pretty face. The characters look terrible when the camera doesn't focus on their faces, art style keeps on changing from episode to episode, sometimes they have these huge eyes other times there's just too much shading, sometimes they look like sticks other times they might have some volume. Similarly animation doesn't have any consistency and keeps on changing throughout. The action scenes are very poorly animated, background looks like it was animated in power point.
Setting and Story:
The setting in itself is quite absurd, why would any sane person want to put a 15 year old who knows absolutely nothing about the kingdom or politics on the throne!? The first episode mentions that Yuuri's soul had to be sent to Earth since there was impending danger to his life in their world but then nothing of that sort ever happens, looks like they entirely forgot about it. At first it's shown that the demons are equally responsible for the conflicts occurring in their world and that is the reason Yuuri agreed to become the king but later it turns out that it's only the humans that are evil and you have the king of the main opposing kingdom who is a one-dimensional character that is evil simply for the sake of being evil.
More than half of the series is just filler episodes and the pacing is quite bad. You'll most likely be questioning if this even has a story or is just episodic since the main underlying story doesn't start until the end of each season. Most of the episodes follow the same formula where the cast gets into trouble and in the end Yuuri unleashes his powers and solves the issue. Junji Nishimura did try to put in a lot of anime original explanations to fill in the plot holes from the LN but it still wasn't enough. For example the scene where Wolfram catches Yuuri from falling, it was physically and logically impossible for him to reach Yuuri given his only clue for searching Yuuri was the name of a continent and it happened in the middle of an earthquake.
Characters and Relationships:
Healthy relationships are built on respect, communication, and consent, this is something this series simply doesn't seem to understand. The author did mention that she's very bad at writing relationships and it clearly shows.
The MC Shibuya Yuuri is your run-of-the-mill goody-two-shoes, he's cringy and practically useless as the king and leaves all the political stuff up to Gwendal and Gunter while preaching about the superiority of peaceful Japan. Then we have Wolfram who is the most insufferable character in the series, he has too much pride, starts off as being racist and is overly obnoxious. Wolfram gets engaged to Yuuri due to a mishap, he hated Yuuri at first but then magically fell in love with him for no reason what-so-ever. He's overly controlling, extremely jealous and both physically and verbally abusive towards Yuuri and Yuuri being a spineless wimp just tolerates all of Wolfram's abuses and doesn't put an end to the mistaken engagement simply because he doesn't want to hurt the feelings of his abuser despite claiming to be straight throughout the series.
Conrad is honestly one of the best characters and the sole reason I don't drop the series, he's kind, caring and very loyal to Yuuri to the point he'd sacrifice himself for Yuuri's sake, his sad and dark past simply adds to his character. He's one of the most fleshed out characters if I say so myself.
Then we have Gwendal and Anissina which is yet another toxic relationship with Anissina being an obnoxious feminist who constantly complains about all men being useless even though she herself isn't any useful. Gwendal is one of those characters that I actually like, he's tough on the outside but soft on the inside and likes everything cute. Unfortunately, just like Yuuri Gwendal doesn't have the guts to tell Anissina off.
Speaking of bad relationships how can we forget Hube and Nicola, Hube is a middle aged dude who impregnated 15 year old Nicola and then abandoned her, thanks to Yuuri's intervention they do get together in the end but I can't see their relationship as flowery as the series make it out to be.
All the female side characters are just fujoshis, including the Wolfram and Yuuri's mothers who try to constantly get these two together. And speaking of Wolfram's mother, Celi, she was the queen before Yuuri but only ever cared about sleeping around with multiple men instead of ruling the country which lead to a tragedy. She never even intervened when her third son was treating her second son like an untouchable for years together. The series falls pretty low and even uses a 10 year old to try and get Yuuri and Wolfram together because who can say no to a 10 year old cute girl, right?
Conclusion:
This series has too many fillers, lots of pacing issues, inconsistent and bad art and animation, flat characters. It truly deserves to be flushed down the toilet!
