Contrary to its humanist image, Hidankyo, the Japan Confederation of Atomic and Hydrogen Bomb Sufferers Organizations, has engaged in contentious politics against the state for decades. This article traces the little-known history of the Hidankyo movement from the mid-1950s to the early 1980s, introducing how this organization formed in relation to the movement to ban nuclear bombs in the mid-1950s and how it grew into an independent social movement organization with clear policy demands after overcoming an organizational crisis triggered by the Cold War politics of the 1960s. The movement slogan for Hidankyo, “no more hibakusha,” did not naturally emerge from the sufferers’ experience with the atomic bombings, but was substantiated through their struggles to confront their adversaries, most importantly the Japanese government.

This article addresses the question of what has contributed to the difference between German and Japanese nuclear politics in the post-Fukushima era. Germany has decided to phase out nuclear energy, but Japan has done the opposite. The origin of this difference can be traced back to the development of the anti-nuclear peace movement in the early 1980s. West Germans turned against nuclear energy as well as nuclear weapons, whereas Japanese peace activists carefully avoided the nuclear energy issue because of their concern over U.S.-Japan relations. The West German peace movement in the following years was in a position to foster cooperation between East and West Germans, whereas the Japanese movement missed the chance to go beyond the Cold War mentality.