Alvida, the female king of the Demon Kingdom, was defeated by the Hero of the Human Kingdom and his party and is facing certain death. Having no other options, she surrenders and pleads for mercy, purely so she can try and kill him again once he's alone. The Hero obliges... on one condition: he wants Alvida to be his wife! After overcoming the initial shock, Alvida accepts the Hero's bizarre proposal. Of course, what he doesn't know is that she plans on using their newfound courtship to finally strike down her mortal enemy once and for all. But what will happen when she finds herself actually falling for him instead?

Demon King GFnote (also known as Demon Queen Wife) is a Fantasy/Romantic Comedy/Slice of Life webcomic written and illustrated by Twitter artist PeaCh88 and is part of a series of comics titled "Tomboy Girlfriends" (the others include Tomboy GF, Oni GF and Sadist Junior).