@Lymus
If it is the case, you can create a bilayers censorship.
The first layer is to block ERO manga which is not published as a hentai manga but have scenes that goes against your standard.
The second layer is to block HENTAI manga.
Both layers will be blocked by default and only opened for readers with certain ages or readers that want to bypass.
As a manga reading site, i believe we should be more aligned with the globally general consensus. For that reason, a manga should only be
Labeled "H" if it is a Hentai manga.
Otherwise, just put a "E" for ERO and warn the users.