* Based on a light novel series written by Yamaguchi Satoru and illustrated by Hidaka Nami.

After hitting her head particularly hard one day, Duke Claes' daughter, Catarina, 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 Catarina Claes, the antagonist of the otome game, who nastily hounded the protagonist until the end. Knowing all the possible outcomes of the game, she realizes that every single possible route ends with Catarina being murdered or exiled! In order to avoid these Catastrophic Bad Ends, she has to use her knowledge of the game and her own wiles, starting with breaking off this engagement with the prince... Will Catarina survive while making her way through this world, where bad flags trip at every turn? Find out in this reverse-harem rom-com, led by everybody's favorite villainess!

Source: J-Novel Club

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Sequel: Otome Game no Hametsu Flag shika Nai Akuyaku Reijou ni Tensei Shiteshimatta... X
Summary: Otome Game no Hametsu Flag shika Nai Akuyaku Reijou ni Tensei Shiteshimatta... X: Unmei no Hito ni Deatte Shimatta...