Insufficient Blu-ray Sales of Hidan no Aria To Produce Second Season

Novel author Akamatsu Chugaku posted in his twitter that the realization of the second season of Hidan no Aria depended on the Blu-ray and DVD sales. He said the producers have been checking the sales closely but the current sales were far below the required amount.

Director Miyamoto Yukihiro posted in his twitter that they have reached close to the second season of Denpa Onna to Seishun Otoko.

ref. the Blu-ray + DVD sales of the first volume
Hidan no Aria: 6,356 copies (one episode, 4,200 yen)
Denpa Onna to Seishun Otoko: 6,628 copies (two episodes, 7,350 yen)

Sources: Akamatsu's twitter, Miyamoto's twitter