"I," a cleaner at the Time Bureau, shuttles through apocalyptic sites, carrying out the ruthless task of eradicating the source of the disaster. The fourth mission arrives on the eve of the Tokyo nuclear explosion, targeting the virus "Pandora" and its creator. However, the target's face bears a striking resemblance to the three previous apocalyptic culprits! Deep in the underground laboratory, the truth explodes like thunder: the white-haired "Doctor" is none other than the aging "I." He claims the so-called apocalypse is a "reset" of a cancerous transformation of space and time, a lie woven by the Time Bureau. As the countdown to the nuclear explosion nears zero, the aging "I" grasps the hand of his younger self and, with resolute determination, presses the virus's release button—"It's finally right this time, kid!" A pocket watch on the wall begins its 71-year countdown, a cruel, ouroboros-like cycle taking shape.