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?

Bug handler Ataru offers Kyutaro a deal--he'll reveal everything about Fumi's past if Kyutaro will do what he asks in exchange. Although Kyutaro knows this must be a trap, he goes to see Ataru... What devastating effect will Ataru's evil plot have on Kyutaro and Fumi?