Marie Belle Breguet, a genius engineer of 'Meister Guild', was dispatched to investigate the abnormality of the Kyoto Core Tower, but to detect the suspicious movement of the military. Meanwhile, crown came to Naoto high school as a transfer student. School is making a fuss about the combination of NaoTou and Bishojo cousin!

In order to save the people from the giant weapon, Naoto and Marie become terrorists and take over the Akihabara Grid. In the now empty city, the army clashes with the giant weapon while RyuZU faces off with her weaponized sister AnchoR...

In order to fix RyuZU and Halter who were rendered immobile due to the electromagnetic attack, Naoto and Marie head to the Ueno Grid to meet Konrad. There, Vermouth tells them the true aim of the Yatsukahagi. Will they be able to repair RyuZu and Halter in the limited time they have until the Yatsukahagi starts moving again?!