As a Vampire Hunter, my job is simple, kill the Mark. I've done this for so long now, I don't know anything else. I'm seventeen, never really had a childhood, I don't even know my own parents, just Yaguri; who knew my mother. My mother had made him promise to take care of me if anything happened to her. So, he taught me everything he knew about education and Vampire Hunting. I joined the Hunter's Association soon after my 13th birthday. Already, Cross Academy has one Vampire Hunter as a student, now that Yaguri is a Professor there, Yona Hatashi has no choice but to be transferred into Cross Academy's Day Class. What awaits her in this Academy?