I actually only read Avant garde Yumeko because I have a fascination for the Mangaka Oshimi Shuzo. Since that Manga is only a One-Shot and separated in less than 10 chapters, I didnt really expected that much anyway.
The Story is about a Girl named Yumeko, who experienced a strange interest in cocks. She can't barely handle it and is getting more and more curious about what a cock actually looks like. (Seems like there is no Internet at that time) .
After hopeless tries in getting in touch with some "material" to look she gets the clue about joining the art Club to get a
nude sketch to fullfill her desperation. This is the moment where the secondary Protagonist appears, Honda. She is forcing him to become her nude model.
This pretty much summarizes the plot in short. I can barely say much more, even the end is kinda fast paced and very open. I dont really got that feel of a finished work though.
The Art is very..very mediocore, and im pretty sure its one of the first works of the mangaka. Thats why you cant expect much more than a Doujinshi-Art Level. Anyway I was pretty confident with the expressions of the characters. The proportions, backgrounds and panels are on a lower Level.
For a short manga in a pevert gag-setting the Characters are also very flat. Yumeko's strange nature and curiosity about cocks makes her funny to follow through the whole Story. Especially the authors note in the end expresses the way you should handle the manga.
Honda is a standard, shy Highschooler who makes his first experiences with a Girl (thats why he can barely handle her behaviours). Together they make out a pretty cute "couple" and I liked to see how the Story between them went out.
The Enjoyment-Level is on a good base, since I like the way the mangaka tells the Story. Since the manga is als pretty nude in several ways (even though the "Special parts" are censored) it was enjoyable the way its made up.
Overall I can say, if you are interested in the mangaka its pretty much worth a look. Its barely an hour of reading, and I love too how the mangaka developed over all the years in his art-Level and Story-telling.
Yet I dont think you will enjoy it very much if you randomly picked up the manga. You should really dont set any higher Standards.