Fumi Nishioka lives with Kyutaro Horikita and his family of "Sweepers," people who specialize in cleaning the minds of those overcome by negative energy and harmful spirits. Fumi has always displayed mysterious abilities, but will those powers be used for evil when she begins to truly awaken as a Queen?

Ten years ago, the Great Sickness of the Byakko Gate claimed Kyutaro's parents, and now the ghost of his mother Toko reveals what transpired! What horrifying deal did Toko strike with the White Queen? And will Kyutaro's love for Fumi change when he hears the truth?