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 rumoured to contain Emperor Gaz's remains. A three-way battle ensues as each party tries to obtain the remains first.

— written by Singan

Note: the OVA contains two side-stories for the first season. The first one takes place somewhere between episode 4 and 6, and the second one takes place somewhere between episode 6 and 10. The OVA was bundled with the 12th Hitsugi no Chaika novel volume.

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Parent story: Hitsugi no Chaika