Fumiya Yazaki

August 1945. In a converted theological seminary on the outskirts of Nagasaki, a young doctor works to help his patients, as unsettling news comes of a new weapon used by the Americans on the city of Hiroshima. When the second nuclear weapon is dropped on Nagasaki, the hospital staff must work to save lives in the midst of the concentric circles of death that their city has become.

Dormant, experimental cells begin to awaken inside their human hosts, turning them into creatures called 'Amazons'. Two Amazons-Jin Takayama and Haruka Mizusawa-transform into Kamen Riders Alpha and Omega, aiming to exterminate the growing threat.