As this is a commercial item, it is protected by copyright. It can typically be found on:
Official websites that sell digital (downloadable) or physical copies (DVD/Blu-ray) of Japanese adult content. SONE-054.mp4
The format ( NAME-000 ) is a standard, highly organized convention used by various, primarily Japanese, production studios to categorize, sell, and identify specific releases. As this is a commercial item, it is protected by copyright