With radiation eating away at their bodies, it seemed like Leon and Doudou would soon be meeting an unpleasant end. All their hopes rested on an experimental cure developed by a long-dead professor. Fortunately, the cure worked better than expected, with both of them acquiring superhuman strength and resistance. Now, Leon faces a difficult choice ... Will he complete his mission and deliver Tsugumi to the French army, or must he abandon any hope of seeing his beloved Marie again? As new and familiar foes converge on Tokyo, mankind's fate rests in the hands of a group of human and inhuman friends ...