Rosario + Vampire 2nd Season

Tsukune Aono has spent a year at Youkai Academy, where he's the only human among supernatural creatures. His unique status has attracted attention from various females, including Kurumu Kurono, a succubus, Yukari Sendou, a witch, Mizore Shirayuki, a yuki-onna, and Moka Akashiya, a vampire who becomes a kind and gentle person when her rosary is worn. Moka's younger sister Kokoa Shuzen arrives, intent on releasing Moka's true darker personality from the rosary, but her actions may have unintended consequences.