At a certain time and place in the future, the popular singing group ZweiWing held a concert that was popular with thousands of fans. Unexpectedly, after singing the first song, the venue was suddenly attacked by a large number of mysterious enemies, Noise. The members of ZweiWing, Feng Mingyi and Tian Yu Kanade, could not wait for the headquarters to issue an order, and decisively showed their most basic SYMPHOCAL combat form... One of the fans, Tachibana Hibiki, witnessed the whole thing and was implicated, which made her completely different two years later...