Sex with children is not legal in Japan. The age of consent in Japan is 16. In most American states it is 18, but I believe in a few it is lower. Rorikon is a type of manga, or Japanese comic book. Comics are not just for kids in Japan and are just as legitimate reading for all ages as books or magazines are in the United States. Rorikon is a subgroup of hentai, or pervert, manga. It is produced because children participating in sexual acts is illegal. Rorikon represents a very small amount of the manga in Japan, and while I am not Japanese, I have been told there are many moral objections there to hentai, and specifically rorikon. There is no organized legislative effort to ban its sale and production, however.