"Yatsukahagi" is the 8th episode in the first season of Clockwork Planet, and the 8th episode overall in the series.
Official Synopsis
By registering Naoto as her master, AnchoR is freed from a continued fate as "The one who annihilates". From the cube that she holds, Vermouth, who sent the shortwave to Marie, appears. He tells the group that the giant weapon Yatsukahagi is powered by electro-magnetic technology. And in Akihabara, that same electro-magnetic technology stops all the gears of the city from turning.
Gallery
Click to view the gallery for Yatsukahagi (episode).