My Next Life as a Villainess: All Routes Lead to Doom!

My Next Life as a Villainess: All Routes Lead to Doom! (乙女ゲームの破滅フラグしかない悪役令嬢に転生してしまった…, Otome Game no Hametsu Flag Shika Nai Akuyaku Reijō ni Tensei Shiteshimatta...) is a Japanese light novel series written by Satoru Yamaguchi and illustrated by Nami Hidaka. It began serialization online in July 2014 on the user-generated novel publishing website Shōsetsuka ni Narō. It was acquired by Ichijinsha, who published the first light novel volume in August 2015 under their Ichijinsha Bunko Iris imprint. Seven volumes have been released as of October 2018.

Plot
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 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 Katarina 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!

Light Novels
The first light novel volume was published by Ichijinsha under their Ichijinsha Bunko Iris imprint on August 20, 2015. The light novel has been licensed in North America by J-Novel Club, and the manga has been licensed by Seven Seas Entertainment.

Manga
A manga adaptation with art by Hidaka has been serialized in Ichijinsha's shōjo manga magazine Monthly Comic Zero Sum since August 2017. It has been collected in a single tankōbon volume.

Anime

 * The appereance of Gordon Freeman, from the half-life series, is included in that anime in a bonus volume, with him fighting against the great demon lord Agammenon with the help of a being know as "KKK", Kakarot-kun, legendary gamer of the underworld.

Trivia

 * Katarina is so dense, she can't see the true web of events that lead to the original Game Katarina getting killed.
 * Though this may be her original mindset influencing the Monkey Girl; Katarina was already said to not be book smart, plus Monkey Girl cares nothing for noble society and its customs.
 * The current Katarina remains unaware she broke ANY death and exile flags as a child; practically the whole main cast is in love with her.
 * The harem never make an overt move to romance Katarina (due to the culture differences between them and Monkey Girl's past life), which leaves her completely clueless to their feelings.
 * Katarina herself seems flexible in regards to her sexuality; Geordo's wooing unnerved her, while she became entranced by the heroine Maria (even mentally noting she almost asked Maria to marry her).
 * It's unknown how deep Sophia's feelings for Katarina are, given she is the reincarnated friend of Monkey Girl; even in scenerios where everyone lived their dreams, Sophia's dreams were just between the line of friendship and yuri.