Majeh is forced to fight an old enemy who has been plotting revenge against him for 300 years. Meanwhile, three men who we learn are responsible for creating the rifts between This World and the Next World continue to plot and scheme.

"Hatsune Miku and her friends Len, Luka, and Rin have enrolled in the St. Diva Academy for Vocaloids, where they learn a lot about the world, themselves, and just how much trouble a determined pack of youngsters can stir up"--

Once they were all friends making songs-but while Kaito might make a duet with Miku, or a duet with Luka, a love song all three of them sing together can only end in sorrow!