Mob Nanoni Vampire-tachi ni Kyuuketsu Saremakuttemasu

Sofia, who was betrayed by her lover in her previous life, finds herself reincarnated into the popular otome game "Vampire Academy Sweet∞Blood." She thought that she could live a peaceful life as an anonymous mob character, but she gets bullied by the ill-tempered heroine Emilia?! However, Sofia's blood is found to have the special property that makes the four Great Vampire Lords all fall in love with her, and her position is switched with Emilia. Now she is the one treated as the precious main character, and she is enrolled at the Royal Academy, where all the handsome vampires attend and dote on her endlessly…?!

(Source: Kadokawa, translated)