Akuyaku Reijou ni Tensei shita to Omottara, Cinderella no Gishi deshita: Cinderella Otaku no Isekai Tensei

悪役令嬢に転生したと思ったら、シンデレラの義姉でした～シンデレラオタクの異世界転生～
I Thought I Reincarnated as a Villainess
but It Turned Out to Be Cinderella's Stepsister: Cinderella Otaku's Reincarnation in Another World

MangaPublishing

FantasyRomanceIsekaiVillainess

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Synopsis

Stella finds herself reincarnated into the beloved fairy tale "Cinderella" as one of the evil step-sisters who bullies Cinderella?! She tries to get along with Cinderella in order to avoid the original ending of the fairy tale, which would see her fall into ruin...!? A unique, realistic (?) Cinderella story that begins with reincarnation! (Source: Mag Garden, translated)