Be wary of files that claim to be "4K" but are only 2GB or 3GB in size. True 4K video with the "Full" runtime of a standard release (approximately 120–150 minutes) cannot be compressed that small without severe quality loss (artifacts, blocking, blurring).

: The title translates to "A Beauty Who Loves To Be Stared At, Nanami Kawakami" (or similar variations depending on the distributor).

Benefits of 4K Resolution

If you meant something else — such as a software tool, hardware model, academic paper, or technical standard — please clarify the term and I’ll be glad to help with a legitimate, detailed report.