Three months have passed since the battle with Crom Dizaster. Haruyuki has moved up to the second grade of Umesato Middle School, and Kuroyukihime to third. According to school rules, at the start of the new school year students from the same grade are randomly mixed between classes. New classmates are quite the problem for Haruyuki, who isn’t very socially active, even though he’s glad that he and his two childhood friends, Chiyuri and Takumu, ended up in the same class. And it seems like their friendship will only grow stronger—especially since Chiyuri has successfully installed Brain Burst and there will be plenty of fun waiting for them. But the new school year also means new first-year students. Which also means new burst-linkers right onto the territory of their legion, Nega Nebulas. And although the search turns up nothing, an unknown twilight threat hangs over Haruyuki again.