A month has passed since their battle. μ has gone into hiding and the Musicians haven't made any obvious moves either. During that time the former Music Prep Room has become the Go-Home-Club room, and the members of that club share a hot pot. While Ritsu is out shopping everyone around him suddenly disappears and the city transforms into a strange place. There μ appears before him and--

The Go-Home-Club members are locked inside the music prep room. The Go-Home-Club president, Shikishima Ritsu, is nowhere to be found. Eventually everyone grows paranoid and begins looking for the culprit. That's when Kensuke proposes that start introducing their true selves. In order to learn more about each other, they begin prying into the darkness within their hearts.