I'm the Villainess, So I'm Taming the Final Boss, Vol. 10 (light novel) — Sarasa Nagase

They're not even the same game!A wedding invitation has come from Vica, Claude's cousin in the Kilvas Empire, and the demon king is all set to attend while Aileen rests at home. That immediately changes when Aileen recognizes this cousin as a character from another otome game and a final boss who looks just like Claude! What's more, they hear there may be a civil war brewing in the faraway empire. Determined to get to the bottom of this, Aileen joins Claude on the journey to Kilvas. They'll have to tread lightly, because if they're not careful, Ellmeyer might get dragged into this whole mess -- and because Aileen's expecting!