In Tokyo and Nagano, kiddie porn posession is legal.
Plus watch any anime and kids and sex will be included almost in all of them.
Japan is pervert land
As far as I know, the CP was made illegal in 1999... not sure about the anime/manga part.. I was never into that stuff. BUT, I will say, when I went to a bookshop when I first came here, I was crapping lava-bricks when I saw, on an end-cap, a book with a nude kid on the front cover :/
I am more comfortable now since it is now illegal..
On a side-note (involving anime/manga), it hurts so much to see 30yo-50yo men reading comics on the train (and yes, most are sexual... and kids can see what they are reading).. Speaking of that.. up until about 2007, many of the advertisements on the trains were sexual, including “loli-con”.. Thankfully, that stuff stopped a few years ago.