You can literally count on one hand the number of games that have gotten an AO for violence. I imagine NC17 is a similarly dry well.
https://i.imgur.com/lfI7zGE.jpg https://i.imgur.com/tgLNUuX.jpg
Come to the (un)official GameFAQs Touhou board. http://www.gamefaqs.com/boards/1110-