Ah, the old topic again. First, anime and manga were forbidden, then they were allowed again. I think that over more and more questions, different things came up, whether such tags should be used, or not. Currently, the tags anime and manga aren't used. Should visual-novel be used? Or should questions like this be edited?
Regarding the visual-novel tag, I think they should not be allowed either, since they are as much of a meta-tag as the other two.
Either that, or they should all be allowed. But I think blacklisting is the way to go.
There wasn't any opposition voiced to deleting the tag, so I removed it from the 8 questions which had it. The tag itself will disappear in the near future since there aren't any questions tagged with it anymore.
If the tag continues to be recreated and used in the future, it might be worth blacklisting, but I don't think it's a big enough problem right now to necessitate it.