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Definitely One Piece.

I don't really know how to explain it,
but it's the only anime that's gotten me REALLY hooked with a series.
And I've been watching anime for a decade or so now
so obviously I've gone through a lot of anime series,
of every genre no less. And One Piece just stands on top.

If I had to say one reason, it'd be because
of the beautiful theme of friendship <333
Plus, Oda (the mangaka) incorporates little pieces of info
from many fairy tales so it's like I'm living through my childhood again
whenever I read or watch it.

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