The 6th and 7th Squads team up to rescue the abducted Yuuki, kidnapped by a humanoid Shuuki...who turns out to be his long-lost sister Aoba. Upon learning about their situation, Yuuki tries to convince his sister to let go of her hostility toward the Demon Defense Force, but their conflicting ideals lead to a fierce battle between the two siblings!

As the members of the wealthy Yamatsukami family are murdered one by one, Hinako, Chiyo, and Narumi stumble upon a crop of roses growing deep in the mountains. Flowers with the same cloying fragrance as those grown by the Virginal Rose cult... There, Narumi and company also find a collapsed woman...who turns her unusual powers against them! The Yamatsukami arc finally draws to a close!