Touhou Project Doujin Ecosystem

The world's largest doujin (fan-created) book convention, held twice yearly at Tokyo Big Sight. Approximately 35,000 circles and over 500,000 visitors gather, functioning as the hub for otaku culture creation and exchange. Beyond doujinshi, diverse content including music CDs, merchandise, and cosplay is traded, with estimated annual transaction value reaching hundreds of millions of yen.

Japan's largest doujinshi fair, begun in 1975. Held twice yearly (winter and summer) at Tokyo Big Sight. Over one million visitors attend, with tens of thousands of circles exhibiting. A venue for diverse derivative works across anime, manga, games, and original creations. Symbolizes the freedom and creativity of otaku culture.

A magical girl anime produced by Seven Arcs that debuted in 2004. It has expanded across anime, manga, novels, games, and trading cards. Known for its high-quality battle sequences and popular female characters, it has gained substantial support from otaku communities with active doujin culture surrounding it.

A 3D avatar creation software developed by pixiv. Operating at the intersection of VTubing, metaverse technology, and otaku culture, it enables users to freely create original characters. It democratizes fan creation and represents a new phase of 3D-enabled otaku economy and grassroots content production.

A major franchise originating from Type-Moon's visual novel adventure game. Centered on the magical war 'Holy Grail War,' it has spawned multiple spin-offs including Fate/Zero and Fate/Apocrypha. Its character design, deep lore, and prolific doujin ecosystem make it central to otaku culture.

A multi-purpose cafe format where visitors can freely read vast manga collections. Equipped with internet booths, private rooms, and shower facilities, they also serve as accommodation. Functioning as a refuge for those who miss the last train, they symbolize a unique aspect of Japanese urban life.

A car culture where vehicles are decorated with anime and game characters. Short for 'itai sha' (painful car), owners express their love for favorite characters on full display. Gaining attention at car events and on social media, it is known internationally as a unique intersection of otaku and automotive culture.