The "Hentai" Prince and the Stony Cat.: Henneko BBS
Hentai Ouji to Warawanai Neko.: Henneko BBS · 変態王子と笑わない猫。 へんねこBBS
Synopsis
Specials that were initially broadcasted as CMs starting in January 2013 and later included in BD/DVD volumes.
Studios: Frontier Works, J.C.STAFF, Media Factory, Sentai Filmworks
Source: LIGHT_NOVEL