Sailor Moon: Season 0, Episode 3

0 - 3: SuperS Special: Chibiusa's Adventure! The Dreaded Vampire Castle

A new student show up in Chibiusa's class named Ririka. Strange things begin to happen — children go missing, flowers die, and the new girl is doing weird things. The Sailor Senshi investigate, and Ririka is revealed to be a vampire. They use an attack on her, and she is released from the spell, only remembering everything as a bad dream.