Hanyuu is the mysterious "transfer student" in Matsuribayashi-hen. She has a pair of dark colored horns on her head, one of which is chipped slightly (however, no one seems to notice or mention them). In fact, she has appeared to Rika all her life, but only in Matsuribayashi-hen and Miotsukushi-hen did she gain the power to interact with others. Like many of the characters, she can be frightening when angered, and with her spirit like nature, her appearance can change with her mood until she takes a physical form. She is the one responsible for the eternally repeating June 1983, which she created in order to save Rika from being murdered. She is very meek and often makes the noise "Au au, au au…" when she is nervous or uncomfortable, or sometimes while trying to make a point. She dislikes alcohol and kimchi, which Rika imbibes in large amounts as punishment when she finds Hanyū annoying (as both Hanyuu's and Rika's senses are linked together). Rika refers to her as "Oyashiro-sama" when talking with others (evident from Shion's chat with Rika in Meakashi-hen) but does not personally think of her as Oyashiro-sama; instead, she sees her as a close friend.