Hitsugi no Chaika: Avenging Battle  

Chaika 2, Chaika 2: Avenging Battle, Chaika, la princesse au cercueil : Avenging Battle (saison 2), Chaika: The Coffin Princess - Avenging Battle, Гроб принцессы Чайки (2 сезон), 관희 챠이카 AVENGING BATTLE, Chaika -The Coffin Princess- Avenging Battle

The quest to locate the leftovers of Emperor Gaz is ongoing. Chaika remains uncertain about her true identity as well as her purpose. Meanwhile, the Red Chaika continues its search for the remaining parts of Emperor Gaz's body. The Gillette corporation persists in its mission to apprehend every last Chaika. During their journey, they come across a concealed account that was kept secret by the Emperor, which Chaika, Fredrica, Toru, and Akari decide to expose.

Hitsugi no Chaika: Avenging Battle mostly tells an anime-exclusive story that utilizes content from novels 8 to 11 of the original novel series. Episodes 4 and 5 adapt the 7th novel.