I think they mean Naked Smiles or something
it occurs to me that they (the Japanese) use the word nuudo(nude) more often than supopon(naked)(spelling?), so I find it natural for them to include that in a title
Besides, we can't have young 14 year old Aika in hawt action on her debut, yesh?
EDIT: Woops, my bad. Forgot her birthday was that early