Any manga oneshots or 5 chapters that has a library or book store or cd shop setting.

Also looking for a manga specifically, they are working at a bookstore and the other guy is a newbie then it turns out that he is a best selling author of a children's book. I think the book reaches how to make a dinosour, or something like an origami.

The manga you're talking about should be Kikagaku ehon
Other manga with similar setting:
Kiss shite Yowamushi-kun!
Itoshii, to Iu koto (second story)
Otona no manaa
Shoga Hamu mushi mo sukisuki
Odu-kun no vita sexualis (second story)
Amayadori wa basutei de (last story)
Good excuse

Thanks