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!
"The 6th and 7th Squads join forces to rescue Yuuki, who was kidnapped by his long-lost sister, Aoba. Upon learning of the circumstances of her and her allies. Yuuki tries to convince them to let go of their hostility toward the Demon Defense Force... but the conflicting ideals of the two groups inevitably lead to a fierce battle. With girls on every side fighting over him, can Yuuki find a way to mediate a cease-fire before it's too late?"--
