The original Mahou Tsukai no Yoru, written in 1996, was the novel that first established the currently known Nasuverse.
Unlike TYPE-MOON’s previous games, Mahou Tsukai no Yoru is not an adult game.
Then in 2012, there was Type-Moon’s Mahoutsukai no Yoru (A Magician’s Night), a visual novel written by co-founder Kinoko Nasu, featuring art by Hirokazu Koyama and music by Fukasawa Hideyuki.