5 - Revue Starlight Movie - Sakugabooru
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OP’s comment: Too bad their SFX is ass.
4 - Demon Slayer Entertainment District Arc - Sakugabooru
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OP’s comment: No one does 3D graphics better in anime than Ufotable and KyoAni to an extent. If you want to find better 3D animation, you have to go west and look for the likes of Disney/Pixar.
3 - Violet Evergarden - Sakugabooru
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2 - Akebi’s Sailor Uniform - Sakugabooru
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OP’s comment: Violet has the higher highs, but Akebi has better and more consistent average quality
1 - Tsurune S2 - Sakugabooru
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Honorable mentions:
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Demon Slayer Infinity Castle - Haven’t seen it, but it seems to improve on the Entertainment District Arc based on the trailer
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The Fragrant Flower Blooms With Dignity - It’s not in my top five simply because I haven’t finished it yet. But as it stands, at its best, it would be at #3 or #2. I mean, look at this. It (and the recent Episode 12 post) inspired me to make this post. It will come down to how consistent its animation quality would be.
I wouldn’t presume to say they’re the “best,” but some of my favorites:
Casshern Sins - post-post-apocalyptic world in which the robots who displaced humanity are themselves falling into ruin. Mostly ruins, twisted rock formations and drifts of rust, all done in shades of gray.and against which the few remaining bits of power, light and unblemished form stand in sharp contrast.
Heike Monogatari - a Japanese epic tale with backgrounds that look like tapestries and foregrounds that look like woodblock prints. If anime had been made in the 13th century, this is what it would’ve looked like.
Yokohama Kaidashi Kikou - deceptively simple 1998 hand-drawn anime with exquisite attention to detail.
Serial Experiments Lain - a primer on how to depict loneliness and alienation in an anime.
Non Non Biyori - lush green countryside has never been done better.
5 Centimeters per Second - Just a succession of absolutely stunning backgrounds, and this is, IMO, quite possibly the most beautiful anime background ever: