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?

Kyutaro and Fumi get a taste of just how formidable the Silver Sea Snake is, and so they set out to the Holy Ground of the Old Byakko Clan in order to get stronger. However, they're in for an unwelcome surprise when they find out what this mysterious clan has in store for them!