When Misaki and Mikoto hit a major traffic jam, Misaki summons the power of the “Exterior” to brainwash every driver in their path to pull aside, thus clearing a path. It’s clearly a significant effort for Misaki, pushing Mental Out to its limits. From there, we learn about how her ability was developed at the same facility as Prototype, perhaps the first Mikoto clone. Her nickname, “Dolly” is a reference to the first successfully cloned sheep.
Dolly ‘s handlers have been unable to make progress with her ever since her friend “Mi-chan” (heavily implied to have been Kozaku Mitori) went away. The white coats (who distressingly see both Dolly and Misaki as merely test samples to be used and disposed of as needed) conscript Misaki to be Dolly’s new lab-issued friend.
Misaki uses Mental Out to brainwash Dolly into believing she’s Mi-chan. Misaki was just as haughty back then, so she’s initialy feels his whole enterprise to be a hassle…until she becomes fast friends with Dolly. Like the girl who was cloned to create her, Dolly is far more athletic than Misaki, as evidenced by her far superior garbage can aim.
At the same time, Misaki tries to impress upon Dolly the importance of growing into a refined lady—a losing battle she picks up with Mikoto, to a degree. Without even intending to go along with the white coats, Misaki ends up restoring Dolly’s “inner peace”, allowing research on her to continue without emotional anomalies.
More than that, Misaki forms a real emotional bond with Dolly, blushing when Dolly suddenly hugs her—and pointedly smells out the deception. The two are simply playing around until Dolly suddenly collapses, her clone body shutting down.
It’s then, when she reaches her hand out for a distraught Misaki, that Dolly asks her her name. It dawns on Misaki that Dolly knew she wasn’t Mi-chan, but kept the fiction going because she was happy to have a new friend, and grateful to Misaki for being one. Dolly’s death is a gut punch.
The white coats are then frustrated when Misaki is the one in emotional turmoil, as if it never occurred to them she’d have these things called feelings. Call it professional detachment from one’s scientific subjects…but Misaki is human, for chrissakes! Showing no deference to them, Misaki uses her Mental Out on all of them and learns the truth: once they’re done tinkering with her, she’ll meet the same fate as Dolly.
The Exterior project continues, with part of Misaki’s brain removed and cultivated into a huge brain, which serves as a booster for her powers—and which is what she used to part traffic back in the present. It’s also the “DNA Computer” the urban legends site mentioned. By the time she and Mikoto arrive at Exterior, Kihara Gensei’s forces have already infiltrated, forcing Misaki’s associate Keitz to flee to the roof with 10032.
But Misaki is too late: Kihara tunes the giant brain to his own brainwaves, bypassing the need for length registration and enabling him to use Mental Out. He uses it to freeze Keitz, takes his phone, and uses it to trash talk Misaki, revealing that it was he who instructed Kiyama Harumi on how to use Level Upper.
He then removes all of the protection placed on MISAKA 10032, something First Order immediately notices while playing cards with Accelerator in a hospital room. Then Kihara injects a kind of mental virus into 10032, which is instantaneously transmitted to all other Sisters in the network, knocking them all out.
Mikoto arrives on the rooftop just in time for Kihara to trigger her dormant esper powers. She’s revealed to be his main target all along, as he hopes she’ll be the first to achieve a stable Level 6. Several floors below, Misaki no longer has access to Exterior, while Touma manages to track down Saten as she’s exiting the factory with Xochitl.
The main pair of powerful lasses, then, will need some outside help if they’re going to have a chance of escaping Kihara’s clutches. Mikoto looks completely out of control—half-Akira, half-Little Prince—or worse, under Kihara’s control. Will spirited, virtuous youth win out over the greed and contempt of an old man with a Gorbachev birthmark? We shall see…