[Voltron]

That may be changing.

A while back, there was a debate in the Japanese government on what exactly constituted inappropriate portrayal of minors. It was a bit of a controversy.
The Japanese aren't as prudish as the West (America especially) when it comes to that kind of stuff, so long as it exists on the periphery and doesn't demand attention.

With the Olympics coming to Tokyo in 2020, there's going to be a ban on pornography in convenience stores. A surprisingly large and easily accessible portion of the magazine racks in Japanese convenience stores are devoted to porn of all varieties, and it's typically at the eye level of a 9 year old, which is super creepy.

Regardless, it'll be interesting to see how this plays out.