Kuro Gal-chan To Oshiri De Asobu Hon (“A Book About Playing With A Black Gyaru And Her Butt”) [English], by Takayama Chihiro
After a friendly gyaru asked a classmate to help her with her homework, her offer to reward him with sex was rejected: the guy has a hardcore anal fetish, and nothing save butt stuff will satisfy him
That was a nice approach, I felt. The easygoing gyaru accepting anything sexual, but having only done vaginal before, we can watch her grow into loving it… And the vanilla-ish conclusion was adorable too, huhu.
I’ll let you to enjoy the pleasant art, I’m confident that one should please lots of readers
We owe this release to Castle, Spicykestrel and Anon, from Castle Translation, thanks a lot!
By the same artist, under the pen names Takayama Chihiro and Maraschino, I also share Houshou-san No Love-Love Days (decensored), Koukuu Bokan Houshou Desu (decensored), Houshou-san Ga Kazehiita, Kanomama chapters 1-2 and Kyouikuteki Shidou.
And now, the download & gallery links 
Open the Complete Pictures Gallery
Download the Free Hentai Manga in a Zip file
(23 MB, 27 pictures, English)
Or you can also use the Alternative:
Zip Mirror #1 – or – Zip Mirror #2 – or – Zip Mirror #3
Granted there are some who “like it like that”, and unless told otherwise it’s the artist’s right to tell the story how he/she wants, nonetheless, my personal reaction to the premise (MC is only interested in anal sex) could be summed up like this:
Her tan was thorough. Can’t have an untanned asshole for butt stuff.