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Touhou Project is based on the Japanese fan game club Shanghai Aili The series of games produced by Silk Fantasy Band have since developed into a field covering many aspects such as games, comics, music, and literature. In this field, works created by ZUN on its own, collaborated with friends, and published in the name of ZUN are called original works (primary settings), and creations made spontaneously by other fans are called secondary creations.

The original works are mainly games, which are divided into old works and new works.