Nasu and Takeuchi later formed Type-Moon, and in 2001, featured a portion of the book in their 2001 Tsukihime fandisk, Tsukihime PLUS-DISC, which saw Kara no Kyōkai gain significant popularity, leading it to be released as a dōjinshi publication at Comiket 61 on December 30, 2001.
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Kara no Kyōkai is set in an alternate universe to Tsukihime and Fate/stay night, with many of its characters becoming prototypes to characters in Type-Moon's later works.
This engine has been used in a number of translations, such as the English versions of Narcissu and Tsukihime.
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Due to its simplicity and its liberal license (while it is not open source, royalty-free commercial use is permitted), it quickly became popular in Japan, and was used for a number of high-profile commercial and dōjin titles, such as HaniHani and Tsukihime.
It also has been used as the image song for the character Yumisuka Satsuki from Tsukihime.
Its fame and renown is often attributed to its comprehensive and expansive storyline and its writer Kinoko Nasu's unique style of storytelling.
The series focuses on funny and absurd situations happening to the various characters of the Type-Moon franchises, mostly from Fate/stay night and Tsukihime.
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, much of which is attributed to Nasu's unique style of storytelling.