Jishou Akuyaku Reijou na Konyakusha no Kansatsu Kiroku.

Life has been dull for the Crown Prince Cecil Glow Alfostar, a genius who can learn anything easily. Nothing excited him until he met with his fiancée, Bertia Evil Nochesse, a girl who constantly surprises him. Bertia insists that their world is actually an otome game, and she is reborn as the villainess to disrupt Cecil’s romance with her heroine. To maintain her evil role, she attempts many schemes, but her actions always end up being kindhearted. Unknown, she brings colour back into Cecil’s life, making his everyday life more enjoyable than the last.