Ao no Fuuin

A girl begins experiencing unexplained illness after relocating to a new city. She attracts attention from many men, including one named Kashi, who attempts to assault her before vanishing. A man later appears claiming to be Kashi, and everyone except the girl accepts his identity. He introduces himself as Akira the Byakko, a member of the Western family, and asserts that she is the reincarnation of Souryo, the Oni queen from the Eastern family, a creature that consumes humans to survive. He claims to be the only one capable of killing her to eliminate her lineage. The girl questions her identity, the source of her human memories, and whether she can escape her fate and survive.