How many total BDs and DVDs did The Virgin Witch Maria (Junketsu no Maria) sell?
From SomeAniThing (A Website that takes into account, BR/DVD Sales from Oricon Charts &amp; Amazon): "The Virgin Witch Maria" sold around 3,100 Sales, from all the volumes of BR &amp; DVD.

This is unfortunate sales, for the series. The odds of a sequel is extremely low. 

http://www.someanithing.com/3059
You can locate the sales, for exact units. On this link. Just look for "Junketsu No Maria" and total up the sales per volume.