This title is part of the "ADN" series, typically associated with the label Attackers (often specifically the "Nadeshiko" or "Adult" sub-brands), which specializes in drama-heavy and "shufu" (housewife) themed content.
The .mp4 file indicates a standard digital video format, and 720p denotes High Definition (HD) resolution. The "-DS-" tag is a common marker used by digital distribution groups or specific "dark side" release encoders. Plot and Performance -ADN-368- I-m having a great time .720p-DS-.mp4