Deep in the shadows of Academy City, Accelerator has gathered with the rest of Group for a new mission. An armed terrorist cell has taken a class of children as hostages--and it's up to the number one esper to save the day and dispose of the evidence. But while playing hero is all well and good, Group's real goal is to find the same thing the terrorists are after: one of the city's most guarded secrets, known only as "Dragon"...!