Speculative Japan is a 3-book series with 3 released primary works first released in 2007 with contributions by Shinji Kajio, Sakyo Komatsu, Taku Mayumura, Mariko Ōhara, Yasutaka Tsutsui, Ryo Hanmura, Hiromi Kawakami, Ken Asamatsu, Hiroki Azuma, Akira Hori and 25 others.