Wa Hakudaku Ni Somaru 01.mp4: A.h.-start Fansub- Kuroinu Kedakaki Seijo

The ".mp4" extension in the file name typically denotes a high-definition rip that balances file size with visual clarity, preserving the intricate art style of the series. What is "Kuroinu Kedakaki Seijo wa Hakudaku ni Somaru"?