What an obscure anime you liked that you think most people don't know about?

I'm afraid my creation of this topic is wholly selfish, as I don't think I've seen a single anime that isn't widely-known. Robot Carnival might qualify simply because it's so old, but it's kind of a classic. Omamori Himari is probably lesser-known but I didn't really like it that much. Nice animation and cute ED, but otherwise generic action harem fluff.

What about you? Is there an anime you like that you think most people have never heard of?