Hitsugi no Chaika OVA

While escaping from the Gillette Corps, Tooru and Chaika hide inside a theater. After a couple of mishaps, they end up taking part in a stage performance along with Akari and Fredrika. Later, the Saboteurs, the Gillette Corps and the Red Chaika's group go to the ancient ruins rumored to contain Emperor Gaz's remains. A three-way battle ensues as each party tries to obtain the remains first.