The mention of "11 volumes" typically refers to the , a series of standalone or loosely connected animated works.
These works are primarily distributed through major Japanese digital storefronts like DLsite and DMM/FANZA . Legacy and Style umemaro 3d 11 volumes 39link39
The 11th installment in this series is titled Pizza Takeout Obscenity (PIZZA配達淫). It was originally released in February 2012 and later saw updated releases with English subtitles. The mention of "11 volumes" typically refers to