Ouji no Honmei wa Akuyaku Reijou, Episode 1

After her death from overwork, an ordinary office worker surprisingly discovers that her life is not over yet. Instead, she has been reborn as Diana, of all people, the antagonist from her favourite otome game “Hoshifuru Koi no Astrolabe”! So when Prince Sirius, one of the main characters from the game, begins to take a serious interest in Diana, his fiancée, she has to think of something fast, because with a bad ending of the game the world could be destroyed. So she decides to seduce Prince Sirius, as he certainly wants nothing to do with such an unchaste person anymore. Unfortunately, her plan backfires and the prince falls in love with her. Can the end of the world still be stopped now? 王子的本命是反派大小姐, 王子の本命は悪役令嬢, Ouji no Honmei wa Akuyaku Reijou, Game World Reincarnation: Sex on the First Night, Tensei Shoya Kara Musabari Ecchi: Ouji no Honmei wa Akuyaku Reijou, The Prince`s Favorite is the Villainess, 왕자의 본명은 악역영애