According to Fujimishobo's notice to bookstores, an anime project of Kadami Takaya's light novel "Itsuka Tenma no Kuro Usagi
" was announced to get underway. The public announcement will be made in Dragon Age magazine November issue to be released on October 9th.
note: Kagami Takaya is the author of Densetsu no Yuusha no Densetsu.
Source: Scan of the notice