Strike the Blood: Kieta Seisou Hen  

ストライク・ザ・ブラッド 消えた聖槍篇, Strike the Blood Special OVA, Strike the Blood: Kieta Seisou-hen, Strike the Blood: Disappearing Holy Lance Arc

As the other girls search for Vatler's ship, Akatsuki and Himeragi find themselves in the school gym with no recollection of what happened yesterday or why they were sleeping on the same futon. They also notice that Himeragi is wearing an outdated school PE uniform with bloomers. To make matters worse, they discover a bloody baseball bat and a missing weapon, adding to the mystery surrounding the empty boat, the bloody bat, and the purple bra in their pockets.