Your daughter.

After mocking the X-rated "Enchanted Legacy" that your idol Kisaragi Takumi is adapting, you've been cursed by vindictive witch-author Daemona to isekai as its protagonist. Trapped in an arranged marriage, falsely-accused of infidelity, abandoned by your royal husband and banished to a temple, your life becomes a checklist of romance tropes – until you meet the infamous Cold Duke of the North. Except this duke isn't the second male lead Ginzawa Kaiyama – he's actually... Takumi himself, who's also isekai-ed from your world?!