September 5, 2013 (indicated by the code 090513 ). Studio: 10musume (owned by the Will Co. / DMM group).
The first six digits are almost always the YYMMDD date format (or MMDDYY depending on the platform's listing), followed by a scene index (01, 02, etc.). 10musume 09051301
While specific audience scores can vary by platform, the general consensus among viewers familiar with the series highlights: September 5, 2013 (indicated by the code 090513 )