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

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 real (?) Cinderella story that begins with reincarnation!