From Seven Seas:
At the age of eight, Katarina, a girl of noble birth in another world, has an accident that unlocks her memories–of playing an otome game that’s exactly like the life she’s living now. There’s one problem: she realizes that she’s playing the role of the villainess, and only bad endings await her! What will it take for her to “break the game” and live a happy…
HIDAKA Nami
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From J-Novel CLub:
After hitting her head particularly hard one day, Duke Claes' daughter, Katarina, suddenly recalls all the memories of her past life: that of a teenage Japanese girl. Just before her untimely death, this girl recalls playing an otome game. That is exactly like the world she's living in now. She is now Katarina Claes, the antagonist of the otome game, who…