Anna and Yoh meet when they are ten years old in 1995 at Mt. Osore, shortly after Yoh and Matamune arrive in Aomori to visit Kino. Yoh is attacked by an oni, unaware that it came from Anna, who cryptically warns Yoh to stay away from her. However, Yoh persists in trying to get to know Anna and eventually learns that Anna's negative emotions create the oni, who are beyond her control. Matamune, as one of the Asakura family's most powerful spirits, was chosen to accompany Yoh to save Anna from herself because her powers closely resembled those of Matamune's former master, Hao Asakura.