Koori no Hana
A novel by Nasu that's read by even less people than the original Mahoutsukai no Yoru scripts. The story is said to be "Just like the title, a beautiful but cold story." About a knight, has nothing to do with magic. When asked about his early works, Nasu once said that the only presentable works (novels) are Kara no Kyoukai, Mahou Tsukai no Yoru, and Koori no Hana.