A Dark Rabbit has Seven Lives OVA
Itsuka Tenma no Kuro Usagi OVA · いつか天魔の黒ウサギ OVA
Synopsis
According to the official website, an OVA of Itsuka Tenma no Kuro Usagi was announced to be bundled with the ninth volume of the novel. An animated crossover between Itsu-Ten and The Legend of the Legendary Heroes (Densetsu no Yuusha no Densetsu or DenYuuDen) fantasy story.
Studios: ZEXCS
Source: LIGHT_NOVEL