I don’t seem to recollect any movie at the moment but here are some TV shows or anime -
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Mr. Robot - one of my favourite TV shows, most people using lemmy might have already watched it.
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Boku no Kokoro no Yabai Yatsu - its about a very lonely middleschool kid’s romance
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Koe no Katachi - very popular anime movie. Also one of my favourites.
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Bocchi the Rock - Anime about an extremly introverted girl wanting to play guitar in a highschool band.
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Re-Life - its an anime about a grown up guy getting a chance to re-live his high-school days as part of a experiment or something like that. It was pretty good.
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Lookism - its a Manhwa, but also has an anime. Basically the main character gets 2 bodies mysteriously. The original body is the ugly one which people bully him for and the second body is like that of a (male) kpop artist which people view differently.
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Death’s game - it’s a kdrama I recently watched. Although it doesn’t exactly fit in with the theme of ‘lonlieness’ I thought I’d mention it.
P.S - some shows I mentioned here might not be as loneliness inducing as you think.