Nasu graduated from Hosei University with a major in human science.
Together with junior high school classmate and friend Takashi Takeuchi, Nasu formed Type-Moon in 2000, originally as a dōjin group to create the visual novel Tsukihime, which soon gained immense popularity.
Nasu's influences include Hideyuki Kikuchi, Yukito Ayatsuji, Soji Shimada, Natsuhiko Kyogoku, Kenji Takemoto,[4] Ken Ishikawa[5] and Yasuhiro Nightow.
Nasu's visual novel work has been adapted to extremely popular manga and anime series.
Among Nasu's earlier works are the novels Kara no Kyōkai, originally released in 1998 and re-printed in 2004, Angel Notes, Mahōtsukai no Yoru and Kōri no Hana.