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?

In a bid to move forward, Kyutaro and Fumi share a sweet secret! Later, when they go to The Inside with Sendai to cleanse Ms. Hayashi's Mind Vault, will they succeed in saving her? And what is Bug Handler Ataru plotting in order to turn Fumi into the Black Queen?