Together with high school classmate and friend, TAKEUCHI Takashi, Nasu formed TYPE-MOON in 2000, originally as a dōjin group to create the visual novel Tsukihime, which soon gained immense popularity, much of which is attributed to Nasu's unique style of storytelling. A sequel to Tsukihime, Kagetsu Tohya, was released on August 2001.
Following the success of Tsukihime, TYPE-MOON became a commercial organization. On 28 January 2004, TYPE-MOON released Fate/stay night, written by Nasu; it too gained great success, becoming one of the most popular visual novels on the day of its release. A sequel to Fate/stay night, Fate/hollow ataraxia, was released on October 28, 2005. Both of Nasu's visual novel works (Tsukihime and Fate/stay night) have been adapted to popular anime and manga series.

Doujinshi circle: The Bamboo Room/Takebouki