According to a scan, Hitsugi no Chaika volume 12 will include an unaired anime-original OVA, to be released on March 10, 2015.
According to another scan, the light novel will end at the same time as the anime's second season, as the anime will be happening somewhat "parallel" to the light novel.
Source: Yaraon
Hitsugi no Chaika OVA on MAL
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Anime