PNOS Ver5.0 Released: 2011-12-31 Developer: Fuuka Soft (風華ソフト) http://kairou.com/who-ka/pnos/index.html https://erogamescape.org/~ap2/ero/toukei_kaiseki/game.php?game=37871 https://www.suruga-ya.jp/product/detail/186028256