Important disclaimer: I don't own Senran Kagura games and have the PSN and Steam profiles to back up that claim. But I was reading how Sony is restricting brutal regulations on crap like Senran Kagura under UN pressure. The guy behind the series then departed.
You can also throw in shit like Gal Gun, Onechanbara, Akiba's Strip, "visual novels," and Dead or Alive in here, but if you were to own these games before those enforcements, could you get into legal trouble? I'll at the least admit I liked and owned some old DOA games. But not much more.
EDIT: It's difficult to find an official Sony statement on their new policies but this is enough
https://nichegamer.com/2018/10/27/ne...lves-in-japan/