Maybe you could try Kino no Tabi (also known as
Kino's Travels or Kino's Journey). It's quite new
(2003) but it's licensed (by ADV), and I think
that if you are looking for something "vaguely"
existential, you definitely wouldn't waste your
time by watching it, even if it doesn't exactly
fits your criteria. There's a movie too.
Good Luck.
P.S: Sorry for my english.
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