Mikoto battles Accelerator.
Biri-biri is mad! Don't make Biri-biri mad or you'll be sorry.
Unfortunately, Mikoto isn't going to kick ass today.
Summary:
After seeing 9982 being killed by Accelerator, an enraged Mikoto attacks Accelerator with iron-sand whirlwind and throwing steel beams but the attacks have no effect. Accelerator figures out that it's the original Railgun that's attacking him, and Mikoto starts to realize who she is up against. Mikoto demands to know why Accelerator is going along with this inhumane experiment if he's already so strong, and Accelerator states that even though he is the strongest in Academy City, he wants his power to be absolute so no one would dare challenge him. Mikoto is pissed off and fires her railgun but Accelerator easily bounces the shot away. Accelerator gets ready to attack, but a group of Sisters appear to advise Accelerator from fighting Mikoto and deviating from the experimental plan and causing too much damage. Accelerator walks away after introducing himself to Mikoto, and afterwards Mikoto falls to her knees feeling dejected and helpless. Mikoto wonders why the Sisters would go along with such a plan, and one Misaka answers that it's because they are created for the purpose of completing the experiment. The Sisters then bid goodbye to Mikoto and start to cleanup the scene of the battle.

Hi there, beautiful. What'cha doin', lookin' so shook up?
Mikoto is disappointed that she cannot use her clone army to help her do chores so she can have fun and fight crime all day.
Mikoto ends up spending the night outside on a bench having nightmares about her clones. In the morning, Mikoto is approached by Shinobu. Shinobu explains that she had been dismissed when the Radio Noise Project was canceled, but was recalled to tend to the Sisters when they were reassigned for the Level 6 Shift project. Shinobu at first went along with the project, but after seeing a Misaka clone experience the outside world for the first time made Shinobu change her mind, and she had been spreading the cash cards in alleys to hinder the experiments. Shinobu wonders what Mikoto is going to do, and Mikoto answers that she is not going to let the people behind the experiment get away with using her DNA map like this. Shinobu informs Mikoto that there are over 20 facilities affiliated with this project, and Mikoto vows to take them all down by herself.
Let me cheer you up with a little song. Lalalala lala, lalalala.
Girls, I dunno how to tell you this, but... I'm dating a guy.
Mikoto returns to her dorm later in the morning much to the relief of Kuroko. Kuroko can see something is wrong but Mikoto doesn't say anything. Instead, Mikoto invites her friends (Kuroko, Kazari, Ruiko and Haruue) to have some ice cream to divert attention. The other girls also can sense that something is bothering Mikoto, but instead of pressuring her they suggest that everyone go to the arcade to let off some steam.
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The previous episode was very good. This week's episode was not bad, but the pace slowed down again. Shinobu's flashback with the Misaka clone put a stop to all the momentum. We are still have a lot of the story arc left to go though, so things will pick up again. It wasn't really much of a fight between Mikoto and Acclerator. It was more of Mikoto throwing her best attacks, failing to do any damage, and realizing that she was hopelessly outmatched. We really shouldn't be expecting anything more though, although it would have been nice if Accelerator attacked and we had Mikoto running around for dear life for a bit. Mikoto isn't going to stop the experiments by defeating Acclerator, so she has to do it the other way by taking care of the facilities that are helping with the project. Mikoto seems to have made up her mind that she is not going to involve her friends, so all Kuroko and the others can do is watch and wonder why Mikoto is looking the worse for wear.