Mikoto attempts to escape from Shizuri's attacks, which proves difficult due to ITEM's third member, Riko Takitsubo, using her AIM Stalker ability to help Shizuri and Frenda home their attacks on her position. Meanwhile, Shinobu, who felt Mikoto shouldn't have to carry her burden alone, sneaks into the basement of her facility where the incubated Sisters are being held, hoping to install emotions into all of the remaining Sisters via the Misaka Network in the hopes that it may move the organizers to suspend the experiments. However, she is apprehended by ITEM's fourth member, Saiai Kinuhata, who was guarding the facility in case a second party was involved in the attacks. Shinobu manages to get the program installing, but it is suddenly blocked by an unforeseen error code, labelled "Breach code no. 20001". Shinobu fires a gun at Saiai to save herself, but her attack fails due to Saiai's Offense Armor ability and she is taken into custody. Back at the other facility, a weakened Mikoto is forced to use her ability to deflect Shizuri's Meltdowner attack, making her realize who the intruder's identity is. Learning of this, Shizuri decides to send the injured Frenda and exhausted Riko away so she can settle things with Mikoto herself.