
if there’s illustrations yeah but otherwise i don’t think a wrap is needed, a written warning but i feel like most kids would walk right past a larger smutty chapter book unless they say it was inaccessible for some reason. with a manga a kid could think it was just a comic and get traumatized/exposed to something they shouldn’t see in moments. Doesn’t seem as likely with a novel
its more that i would like to see a more physical, unavoidable warning that the book has adult content. romance books with cartoony covers look very unassuming to children and parents. i also dont think the manga example is very different from a kid skimming through a book at the store and finding inappropriate content in it.