Team GROUP captures a blackmarketter for questioning who is later killed by an esper wearing a steel helmet. Etzali investigates the blackmarketter's home but a black ops team arrives. Etzali disguises himself as one of the operators but not before leaving some clues to his team. GROUP learns the blackmarketter sold a weapon to a sniper named Sunazara whose target is Monaka and Accelerator stops the assassination attempt after Awaki teleport him to Monaka's location. GROUP soon learns the assassination attempt was a distraction for another darkside team named SCHOOL, lead by the 2nd Level 5, Teitoku Kakine, and their real target was the particle engineering laboratory. To further complicate matters, the other teams like MEMBER, BLOCK and ITEM are getting involved as well. Meanwhile, the former Skill-Out Shiage is now working with Team ITEM, led by the 4th Level 5, Shizuri Mugino and her teammates, Rikō Takitsubo, Saiai Kinuhata and Frenda Seivelun, who treat Shiage with no respect. Learning about Monaka's assassination attempt, ITEM reazlies SCHOOL's real goal and heads to the particle engineering laboratory only to fight with the steel helmet esper. Despite killing the esper, Teitoku escapes with the device he stole, forcing ITEM to split up while Shiage runs away from SCHOOL's Pink dressed Assassin. Elsewhere, GROUP learns Team BLOCK is planning to steal Biological weapons from the city's virus vault but Etzali reveals the vault is a decoy as their real target is Satellite control center which controls the Hikoboshi 2 orbital laser weapon in space. Accelerator heads to the Satellite control center alone to fool BLOCK that they are falling for their trick.

While Hamazura is out running errands for Mugino, SCHOOL stages an attack on ITEM. When Mugino runs from Kakine, Takitsubo offers to protect Hamazura, but ends up needing his help instead. Kakine issues a challenge to Accelerator.