That's pretty ridiculous; it's fine to put clear plastic wrap over the cover, to protect little kids from reading mature manga, and so people can't read the entire book in the store... but how are people supposed to know if a title is interesting or not if they can't even see the cover art or read the description on the back? Plus, honestly, if some 13-year-old kid wants to look at some porno comic, he'll find a way to get it. And if they're so scared of a little kid finding a mature manga, they should have a separate section for books rated 16+, or 18+, instead of shelving them with Tokyo Mew Mew and Sailor Moon.