Kimetsu no Yaiba is truly something but not in a positive way.

It never tried to do anything that was never done before as the author since the beginning had in plan what the series would have become. The truth is, for whatever reason, the easy stuff that should have gotten right was done the opposite and the author never learned from her mistakes to make the story more consistent later on instead she went out of her way to worse things up.

Kimetsu no Yaiba suffers from mainly 3 things:

1 - It's writing
2 - Its comedy
3 - Its villains

1 - I hate it to say this but the writing is bad. It all consists of turning a character into a human since somehow she had become a demon and Tanjiro, her brother has to take a lot of pain to achieve this goal. By pain I mainly mean doing unbelievable stunts, getting hurt without consequences (well, directly to him since there are characters that die while saving him), and having insane luck. Of course, all this happens because of the way it's written. The author has managed to make the protagonist untouchable by literally anything. It doesn't matter what happens, he and her sister will survive. From chapter one when Tanjiro encounters Giyuu and the latter is about to kill Nezuko. Tanjiro saved her because he impressed one of the strongest characters in the series. A guy that has been killing demons left and right is impressed by a cheap trick is what the author is making us believe as if this has never happened to him Before. To the last moment of fighting which Tanjiro has still the power of God within him.

In the early chapters, we get introduced to two more characters that appear out of nowhere and help Tanjiro on becoming stronger. We never got any explanation why that's the case and how that's possible because slightly after Tanjiro finished his training we learn from Urokodaki that the two are actually dead and they were once his students. How's that possible they were able to interact with Tanjiro? Are they ghosts? Is that even a thing in the Kimetsu no Yaiba universe? Because the author NEVER mentioned that phenomenon anymore. At worst this is a crazy asspull we've got to witness. Clearly, the author didn't know how to make Tanjiro stronger that would make a lick of sense and she just went on the stinky territory.

Since this is a shonen, it's imperative for everyone to help Tanjiro because the odds are that Tanjiro and Nezuko are the only ones that could actually defeat Muzan. Throughout the story, many individuals help him because they see the courage held within his spirit and the so-called desire to help his sister. They're moved by their sad story and of course, they risk their lives for two random kids they just met. On the other hand, the fights are extremely dull. They seem flashy but none use any strategic means to beat them. They go full-on-power and directly attack the enemy without causing them any damage. As for the development characters get, is not much. In fact, the one important character that has the most development happens to have less screentime. It is weird and I was really hoping for other characters to have the same growth as well which sadly didn't happen.

2 - The comedy at first didn't even exist. Not until Zenitsu and Inosuke were introduced. The two are the classic yelling guys that so happen to accompany the protagonist on his quests to save his sister. The reasons for this simple fact are to this day yet unknown but they do and so we get to witness all sorts of 'jokes' that not only aren't funny and would make anyone die inside but they're placed in such a nuisance that affects their battles as well. Zenitsu yelling for a half episode but for some reason when sleeping he gains some OP power which naturally makes us question why didn't he do that earlier? Did we really need to hear him yell like a maniac? The same goes for Inosuke. He doesn't need to sleep but regardless in a lot of cases he still gets OP for really no reason accompanied by the lovely 'comedy' that is yelling. Yes, the comedy in this series is yelling. That's it! Are you on the floor laughing right now? Laugh goddammit! Laugh!

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA - Zenitsu and Inosuke in a nutshell.

3 - They're simply bland. Whether they had an over-the-top personality or a calm one, they're extremely poorly written because they gain nothing and get effortlessly beaten. A villain gets introduced, monologues for like a chapter, beats the crap of the good guys but somehow gets cornered and dies because the good guys had a stronger will and didn't surrender. No strategies are involved, just swords slash, a few random powers usually bestowed upon the protagonist and a friendship speech just to cool off the whole thing and the villain is done for. What's worse is its flashback's purpose that exists only to show one's forgiveness rather than showing its motivations. Well then, let me ask you this, why do they repent themselves on the verge of death? Is that a requirement? Because, as far we have seen no one has actually done so in their full power. What the author is trying to get us to understand is that everyone deep down inside has a good soul and deserves a second chance but this is NOT the way to go about it. If nothing else you can have one or two characters that are inherently good and have them change but it shouldn't work for anyone. Not everyone has to be a good guy just because the protagonist is the classic 'gentle guy' that wants to save everyone for literally no reason.

Furthermore, the rest of the characters aren't great either. Aside from the main cast, which is the worst in the series, everyone else, despite all having a different and cool personality, are bad. Not by default though. Some of them have a cool 'sense of justice' but are badly developed and it saddens me. A few die too quickly that get little to no development and some others take an awfully long time to either win or die and in the midst of that, even though they do receive a somewhat interesting flashback that would define their objective at best, is placed either too soon or too late. Never in the right spot that would not distract them from the battle itself in receiving a random and unnecessary bust of their powers.

As for the ending, is really bad. Because not only Muzan death was anticlimactic but the whole reincarnation thingie was not necessary to the story itself. You could have added a few more chapters and added a time-skip that would have solidified the case at best but alas it didn't happen.

Last but not least, art. It's not bad. It's definitely somewhat original although not very detailed and at times sloppy. It's well-drawn when it is but it's unnecessary awful in other cases. It's rushed. You can see the author just didn't have enough time to work more with it and left everything like that. Though, it's her first work therefore she's forgiven.

All in all, Kimetsu no Yaiba is overrated. There are some likable characters here and there but that's about it. It didn't do any good for me and I hope this review will share the truth among all the lies that have been spread since its anime adaptation.