Your story for My Girlfriend is An Evil Overlord (apologies in advance for bringing up an old topic) kinda resembles the sub-plot in The Lucifer and the Biscuit Hammer:

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The "princess" is supposed to save the world from the evil "mage's" Biscuit Hammer, which will crack the Earth in two, and her "knights" are supposed to defend the "princess" against the "mage's" "golems."

But the "princess" actually wants to destroy the world herself, and one of the "knights", who is her neighbor, doesn't care what happens to the world, and so the two secretly plot to destroy the world their way.


Kinda... The whole dragon/black knight/right hand man/boyfriend bit. Your guy character even looks like the guy in the manga.

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compared to