Vampire Princess Miyu S01 E03 The Forest Calls

After beginning her new school life at Tokiwa Gakuen, Miyu befriends classmates Chisato, Yukari and Hisae. When another student, Yuko, tells them about her brother, who seems to be suffering from bizarre nightmares since an ancient African mask was brought home, Miyu visits Yuko's house and immediately recognizes the mask to be a Shinma.