Japan is a much more Collectivist Culture than The United States of America is at its baseline, a fact that is indeed relevant to understanding entertainment media made in Japan.
But people with a Collectivist ideology (in both its Right Wing and Left Wing forms) do exist in America and do sometimes make art to reflect those values. So I have no doubt there are likewise Individualists in Japan.
So I do think people analyzing Japanese Media in the West make a mistake in assuming by default it’s always intended to be read as Collectivist.
Anime, or more so the mediums that are the frequent source material of Anime, are very Niche in Japan. And Niche in a way that makes them attractive to a variety of different people outside the norm of Japanese culture in different and often mutually exclusive ways.
Make no mistake, most Anime is still presenting an ultimately Collectivist worldview, especially the Anime that are among my favorites like Robotics;Notes and the entire Magical Girl Genre since I am a Communist.
However I have spotted the occasional Anime I think does have an Individualist Message in rebellion against the Collective norms of Japanese society. Interestingly they mostly seem to be Light Novel adaptations. Not all LN adaptations however, Durarara!! Has a very Collectivist ethos as do most that got an Anime even before it did.
It’s mostly in those very LN trends that have dominated LN based on Anime since like 2014 or so. Isekai, Magical Academy shows and so forth. Not even all of them ultimately, maybe not even most, but enough that I find it notable.
Take the 2011 show Ben-To which I found very fun but did notice a few points where it’s moral seems to come from that “if everybody wins then nobody wins” mentality. Shield Hero I know has appealed to the Randian Objectivists in the Anime Community and Log Horizon has also been described as preaching Libertarian ideology. C: The Money of Soul and Possibility Control is an even more economically Libertarian Anime but it's not a LN adaptation though.
Another interesting, indeed to me annoying, trend in Isekai is how whenever its premise involves an entire Classroom being Isekaied it’s always initially about the MC being separated from the rest for much of the story. I really want to see one that’s from the start about the entire Class working together without there even needing to be a single main character.
This is paralleled by how those Magical Academy shows always star a main character whose special ability completely dwarfs everyone else. The very aspect of the _____ ______ formula one would expect a more Collectivist Culture to remove or at least downplay they instead double down on.
Among Americans who strive to be Collectivists there are still elements of Individualism that passively remain in our thinking because of that being our culture’s baseline. A lot of Internet Leftist Infighting is Leftists accusing other Leftists of being Individualists while being blind to the Individualisms in our own thinking.
And the same frequently happens in these Anime I have alleged to be ideologically individualist. Anime named for a single Chosen One protagonist often wind up doing better at depicting teamwork then American Superhero films named as being about a Superhero Team.
Those Entire Classroom Isekai premises I complained about before do inevitably reunite the Protagonist with the rest of the class, how long that takes varies. The recent Loner Life in Another World that I’m watching the currently airing Dub of on HIDIVE is perhaps the most subversive of this trend as much of the comedy is the protagonist being prevented from fulfilling his desire to be left alone. In fact at times it seems like its thesis is that a “Loner” is the best mediator between the various Cliques. Actually the most surprising thing about the show is how it opens on a whole “break down of all the High School Cliques” scene that I usually only expect in American High School Dramas.
And then there is Classroom of The Elite, a Light Novel series with a contentious Anime Adaptation. Long before I had any of the other thoughts I’ve based this post on, I've suspected that the key to understanding Classroom of The Elite may be that it is exploring the Tension between Japanese Collectivism and Capitalist Individualism.