I just started the anime since I was bored and the description just seemed interesting.
I didn't think it would be as good as it is.
It's not good. It's awesome!

Story: 15/10
The story just seems perfect. Most shonen anime have a complicated story with many details with just seem unnecessary. But Demon Slayer just had a story with everything at balance. Emotion, hype, flashbacks, fights, everything!

Animation: 15/10
The animation is just awesome. I can't describe how well it enhances the anime and just makes everything look nice. It has a great line art style, and a great use of CGI. And it's just great like it uses flashes and lights and everything and it's probably one of the anime with the best animation. It's just so unique and so awesome. It's just so polished and shiny that I'd say that the animation could be one of the best in the anime industry.

Characters: 10/10
The characters seem just so balanced but not balanced and everything sort of makes sense. It just seems it makes sense with the story. And every character is different in their own way. Like Tanjiro is calm, Inosuke is aggressive, Zenitsu is scared, Rengoku is ablaze, and Giyu is just kind of polite.

Character development: 10/10
Tanjiro lived a perfectly normal life, but ended up as a Demon Slayer. Inosuke just wanted a normal life, but also became a Demon Slayer. Inosuke just wanted to fight people, also became a Demon Slayer. Tanjiro thought he would never be able to be strong, but became pretty strong. Inosuke didn't care about being a Demon Slayer, but now wants to surpass many. Zenitsu thought he would die in battle, but till the point I watched he didn't. It seems that each episode makes every character more stronger, more better, and it's perfect!

Comedy: 10/10
Demon Slayer isn't really a comedy anime, but when it does have comedy, it does it perfect! Like the comedy scenes aren't too long, but they still feel complete!

Music and sound effects: 12/10
First of all, the first intro, Gurenge, IS JUST AWESOME! It's visuals and song and music and everything make it great! Now for the sound effects and background music, it's also just perfect. They are used at the perfect time and are composed perfectly.

Voice acting: 10/10
The voice acting is fabulous! Like the time when Zenitsu says 'NeZuKo-ChAn', and when Nezuko makes 'hm hm' noises, it just feels like the voices would be the same in a real life situation.

Conlusion: 100/100
The anime is totally awesome! Everything is awesome from the story to the animation to the characters to the character development to the comedy to the music and sound effects to the voice acting. Everything helps the anime be perfect. Demon Slayer may even be the best anime ever!