The Tokyo Metropolitan Assembly is deliberating stronger regulations on sexual images of minors in "manga" comic books, animation and video games.

If the revised ordinance is passed, publishers will have to exercise greater restraint on content with sexual depictions of characters that people can assume to be underage. The tougher ordinance would also designate publications that express sexual violence and other material deemed outside the social norm as "noxious" and restrict young readers' access.

Cartoonists and others have lodged protests over the proposed crackdown, which was introduced by the metropolitan government, arguing it could violate the freedom of expression.