Sonny Boy is undoubted the best anime I've ever seen (and I've seen like 150+).
It's
the only one* I can wholeheartedly say is
good (and not "good,
for an anime...", but legitimately an impressive piece of art).
Dense, extremely intelligent, thought-provoking, visually interesting. No stupid cliches, no typical anime archetypes.
It's
confusing on a first watch, but as you keep going you realize the confusion and seemingly schizophrenic plot are
very deliberate. It's part of the message. It's confusing nonsense where characters appear and disappear randomly because
real life is a bunch of confusing nonsense where people come into and leave your life without any notice, and more often than not without real 'closure' to anything.
One of those things that you can and should 'analyze' after watching. And probably rewatch, too.
And that ending was
a nice little gut punch to cap it all off. Not even a 'fun' gut punch. Just a whimper. A very grounded "yes, this is how life actually is, there are no 'happy endings'. There are no real 'endings' at all."
I am also very very happy it didn't cop out and didn't ship the two main(?) characters by the end. It's very bittersweet. Everything's the same... but the protagonist evolved as a person. Not completely, just a little tiny bit. He's still the same person... but he learned something from the experience.
I dunno, I can (and did!) analyze that story for hours. It's amazing it came out in 2021. I didn't know the anime industry is still capable of putting out stuff like that. It's something you'd expect from that late 90s/early 00s era.
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EDIT: I suppose End of Evangelion and Studio Ghibli movies are also candidates. Other "great classics" like Haibane Renmei and Lain and Texhnolyze are great.... for anime. Sonny Boy transcends that in my opinion.