I'm the Villainess, So I'm Taming the Final Boss, Vol. 4 LN by Mai Murasaki

Aileen had set off on what was supposed to be a diplomatic mission to thecourt of HolyKing Baal-so how did she end up in his harem?! What'sworse, Baal is the final bossfrom the third game in the series, and he'simmune to Claude's magic. Now that it'scome to this, is Aileen's only choiceto woo King Baal?
Binding: Paperback / softback