Written by the creator of Doraemon's first assistant, supposedly based on his experiences as a teacher.
One of the lost treasures of ENF. I always wanted to see this translated.
Amusingly, the artist has done tons of fanart of his own manga, including putting out several "fan books." Like, a lot of them. I had some of them downloaded from WinNY back in the day, but looking on them apparently a good number of them (perhaps not the lewdest ones) are on Kindle now. Black, White, and Pink Box, which I think are 3 volumes of slightly more dirty comics, just like the originals.
Looking at some of the stuff on Amazon... looks like he compiled some of the rare books and photo galleries into two tanks (sadly, not on Kindle):
https://www.amazon.co.jp/まいっちんぐマチコ先生「お宝-」コレクション-1巻-えびはら-武司/dp/4835455789/
https://www.amazon.co.jp/まいっちんぐマチコ先生-「お宝-」コレクション-えびはら-武司/dp/4835455797/
Official homepage 1: http://www003.upp.so-net.ne.jp/maicching/index2.html
Official homepage 2: http://www.oo.em-net.ne.jp/~machikosense/page002.html
Official homepage 3: https://machiko-sensei.jp/
Random thought: Recent update shows that Machiko is being used in an advertisement campaign for permanent hair removal. Um, I always just presumed they didn't draw it to avoid being censored.