An anime where a masked guy with amnesia fights against some evil empire, have forgoten its name and im not talking about Guin Saga ? ? ?

"The oldest and strongest emotion of mankind is fear, and the oldest and strongest kind of fear is fear of the unknown"

Perhaps Utawarerumono?

Here is the Wikipedia page

It's based off a visual novel.

Can you imagine an imaginary menagerie manager imagining managing an imaginary menagerie?

No doubt, it is Utawarerumono.

Obviously it's Sailor Moon. I'm sure I remember when I watched it that Tuxedo Mask loses his memory through a pretty large part of the series.

Utawarerumono was the second one I thought of.

Utawarerumono. Hakuoro, anyone?

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