Oba-Shota Harem [English, 190 pictures], by Aihara You
On the plus side, it’s a complete tank, 190 pages long, it’s got plenty of sexy women loving dick, and there are many exceptional panels with only little amounts of censorship.
On the “wtf ew minus, I said MINUS” side, save the first third of the manga (4 MILFs help themselves to a good-looking available male teenager, showing him the ropes), the rest of the volume is weird as fuck. Allow me to quote this arc’s introduction: “Sex zombies! The dead came back to life as sex zombies and rape any survivors they came across!!” Moreover, most of the images felt like overexposed photos: save the areas that were contrasted enough, the rest of the surfaces were just blank, without shades or screentones that would have allowed to reveal volumes and shapes. And don’t get me started on the “anatomically less incorrect” X-ray shots T__T
Well, it’s still a tank, so if it’s to your tastes, you should have a great time reading
We this release to Brandon, Potato, Tester and Kath, from Hennojin, thank you!
And now, the download & gallery links 
Open the Complete Pictures Gallery
Download the Free Hentai Manga in a Zip file
(218 MB, 190 pictures, English)
The occasional rant about excessive file sizes: I downloaded it myself as a HUGE 756 MB archive, in which the images were at or above 4949 pixels high. So far, only 2 persons told me they had monitors with that kind of crazy picture height. For everyone else, I deem it as needlessly big. I allowed myself to shrink the images to 3000 px before sharing, this is very high resolution already. And with that, the archive’s size fell to 218 MB, 538 MB smaller
Or you can also use the Alternative:
Zip Mirror #1 – or – Zip Mirror #2 – or – Zip Mirror #3
–
Smaller version incoming!
As of usual when ☑ the images are in high enough resolution and ☑ the archive is quite big for its number of pictures, and ☑ it offers a significant gain, and ☑ I have enough time to do it, if it may help, I’m offering you a smaller version, in which I resized the images to lower-standard 1600 px resolution.
The zip shrank from 218 MB to 85 MB.
Personally, I prefer it for reading, and it takes less disk space.
Download links, Zip: Mirror #1 – or – Mirror #2 – or – Mirror #3 – or – Mirror #4
An affront to my eyes, lower half, and sanity.
Somewhere in that scrum of drawn sex there was a sweaty good time happening, but the audience was not allowed to see it.
As for that zombie story (can I call it that)? It was like the unholy spawn of that TV series Lost and a hentai of a campy 70’s film.