The AVAL Science Foundation has been attempting to cause a Second Great Collapse by installing artificial keystones throughout the city! At this rate, everyone in Tokyo will be transformed into monsters, and the city will become a hellscape! In order to stop their plot, Chihiro and his friends head to the Infinity Theater where Kark Kaburagi is performing a concert. As the reaper's deadly melody rings throughout the theater, total war breaks out between Chihiro's friends and the AVAL Science Foundation. Will they be able to stop the Second Great Collapse?!