Fukushuu no Tame Psycho Taikou-sama to Kekkon Shimasu

After enduring years of unjust abuse from her adoptive family, Isabella White finally manages to escape White Manor. In the midst of her peril, she unexpectedly discovers she is a witch. Her newfound powers are witnessed by her sister's fiancé, The Grand Duke Xenos. Instead of taking her back, he offers her a deal: her powers in return for revenge—through marriage. What will she uncover on her path to vengeance?

(Source: POCKET COMICS)