10musume 121314 01 Azusa Sasaki -

: An Azusa Sasaki is a well-known color designer in the anime industry, credited for work on series like Lycoris Recoil , Erased , and Monster .

The string "121314_01" is the specific release code, following the studio's naming convention where numbers often represent the original release date (in this case, December 13, 2014). Overview of Azusa Sasaki and 10musume

The search results indicate that refers to an adult video (AV) production from the Japanese studio 10musume (also known as Tenmusume), featuring the actress Azusa Sasaki .