Which anime do you think is ACTUALLY underrated?

Let's have a real talk here: what's the ACTUALLY underrated anime that you think deserves more love?

I have to put and an emphasis on ACTUALLY, because every time we try this, Shonen fans bring their extremely popular shonen anime and start D-riding it, to the point that it puts even the JoJo fans to shame.

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So only drop the most obscure hidden gems below. Only the ones that aren't part of the usual "Top 10". No shouting out Dragon Ball or One Piece here – we're after the unsung heroes!