There was a good thread on this genre.
https://www.akiba-online.com/threads/live-action-and-original-source.1565098/#post-3092019
I too got MUDR-006 a few days ago and watched most of it.
Frankly I was a bit disappointed. The girls are not nearly hot enough to justify the association with the doujinsihi. The mom's figure is not even average MILF, the little one, Marie Konishi, being the loli girl, of course has no tits, but her face is forgettable and her ass is plain ugly (a view I had to suffer due to the position she rides him), and any video with Kurea Hashumi in it is potential a dud.
The quality of the women aside, the action scenes, for a harem vid is also sub-standard.
Ehh... okay I checked the hentai hans kindly provided. The manga (page 119 to 134) is supposed to be the chapter covered by the JAV. I think there's just no comparison.