According to the official website, an unaired episode of Papa no Iukoto wo Kikinasai!
will be released on the fifth volume of the Blu-ray on July 11th. The length of the series is 12 episodes plus one unaired episode.
According to the official website, each of the six Blu-ray volumes of Amagami SS+ plus
will carry a short extra anime. The first volume will be released on April 4th.
Sources: Papa Kiki official website
, Amagami official website
Papa no Iukoto wo Kikinasai! Special
Amagami SS+ plus Specials