Plot: To help with the reconstruction of the Dragon Empire Branch, Saya Yatomi returns to hold a special event, the "Happy Vanguard Festival", along with fellow idols Lisa Ferris and Remy Altena. Drawing many attendees, the festival moves on to the main event: a stage performance in which Saya, Lisa, and Remy try to show the evil "Black Vangua-rou" the fun of Vanguard