Hitsugi no Chaika: Nerawareta Hitsugi/Yomigaeru Iseki
Japanese title: 棺姫のチャイカ ねらわれた棺 / 蘇る遺跡
Type: OVA
Episodes: 1
Source: Light novel
Genres: Action, Adventure, Fantasy, Romance
Studios: Bones
Duration: 23 min
Rating: R - 17+ (violence & profanity)

Unaired anime-original OVA bundled with 12th volume of the Hitsugi no Chaika novel.