The Undine-maniac witch Pamela and the sunshine Undine girl Nietzsche portrayed as a couple. One of the Yuri pairings of the series.
Pamela, who is researching Undines, tells Nietzsche "become Pamela's!", stalks her, and finally tries to buy her from the Royal Army.
In response to this, Nietzsche says things like "It must've been lonely searching for Undines all by herself" and "Nietzsche will take care of her, so can we please bring her along?".
They may be a bit mismatched, but at least there's love here.