10-nenkan Karada wo Nottorare Akujo ni Natteita Watashi ni, Nidoto Kao wo Miseruna to Konyaku Haki shitekita Kishisama ga Kyou mo Sugattekuru

Sadie, a countess, had made a name for herself as the evil woman of the century while her body was taken over for 10 years. She has returned to her former self during her engagement being broken off by Rufus, the Knight Commander. She said she was "taken over", but nobody would believe her... Sadie begins a steady search for the culprit who took her body. Rufus, on the other hand, is perplexed by Sadie's sudden change in personality... A fantasy of two one-sided loves that slowly approach each other.

(Source: Kodansha, translated)