Kyûketsu Shôjo tai Shôjo Furanken (2009)

Transfer student Monami has a secret and a past that has caught up with Mizushima. Deceiving Mizushima into eating a token gift of chocolate, laced with her blood, he is then catapulted into Monami's vampire world of blood, death and love. Jilted girlfriend Keiko has other ideas. With a sudden twist of fate, she is then transformed into the hideous and unforgiving Frankenstein Girl, and the battle for Mizushima's heart begins.