Touhou Project is a popular series of adult-oriented video games created by the Japanese developer ZUN. It features a large cast of characters in a fantasy world based on traditional Japanese myths and folklore. The series is known for its intricate, detailed artwork, its wide variety of characters, and its quirky sense of humor. Touhou Project has been popular among adult players for its challenging and unique gameplay, as well as its mature themes and characters. The series also has a large following in the otaku culture, with multiple fan conventions and merchandise being released.