Ginga Watarai's death puts an end to the incident at the experimental city. During all of the chaos, Arato had revealed his feelings to Lacia which she accepted. Yuka has mixed feelings about this sudden new coupling within her household. Meanwhile, the security police and Lacia-class masters begin to respond to the ever-changing situation.

Pushed by Shiori and Yuka, Arato decided to face Lacia once again. If his last order was still in place, Lacia should be trying to stop Snowdrop. With this thought, Arato heads towards Mitaka, a place which has transformed into an unrecognizable landscape by Snowdrop's power.

Once again, Methode appears to stand in the way of Arato and Lacia down in the underground facility containing Higgins. They must also be wary of Snowdrop who had been sent there by a rival super intelligent AI. As the conflict escalates, Arato and Ryo try their best to fulfill their duties as representatives of humanity.