This essay is intended to be part 2 of my reflections on Japanese STS. Following my review on the criticism of Hidetoshi Kihara and of the late Hitoshi Yoshioka and Osamu Kanamori in the last issue of EASTS (Tsukahara 2018), I would like to pay particular attention to the origins of Japanese STS and the "prehistory" of the making of EASTS from a Japanese perspective. To do so, I take a historical approach, not only because I am a trained historian but also because I experienced the process of Japanese STS's formation firsthand---the very process that Yoshioka, Kanamori, and Kihara were writing about. It is a reflection of myself, committed history in itself. I offer a brief history of STS in Japan, from its theoretical and institutional origins.
