Grummen sponsors the construction of the Infinity Theater, where Kark will play a piano performance of a requiem at the opening concert, and a giant trap door is built on stage for unknown reasons. Tsubaki and Akira rejoins the alliance with the goal of stopping Chaos's plans. At the Malthus Church, Dux says that the six installed keystones almost form the Big Dipper, while Chihiro was previously told by Kakihara that the seventh one is installed at the Infinity Theater...