"August 10, Part 1" (八月十日① Hachi-gatsu Tōka ①?) is the 18th chapter of the Toaru Kagaku no Railgun manga series.
A young Mikoto looks at a young boy struggling to walk in a laboratory and is informed by the scientist that he has a form of sclerosis, which causes muscle degeneration. He continues, telling her that he would eventually die from respiratory or heart failure; the only way of curing him is by providing them a sample of her DNA. This is supposedly to control bio-electrical signals and reroute them to another nerve signal network so they can gain control of a muscle. Looking at the suffering children, Mikoto (naively) agrees, the dream ends with her agreeing and spotting a young Shinobu in the background.
Mikoto wakes up from her dream to find Kuroko hugging her, to which she physically retaliates. Now walking outside, she tells Kuroko her plan to go shopping who tries making it a shopping date, insisting that they go through a shortcut to the shopping district. As she is going through the alleyway shortcut, she encounters a few people and after squeezing past a few, meets a particularly large person. She teleports past him, but trips over a can on the other side. While on the floor, she finds an open envelope and on the inside is a bank card.
The duo go the Judgement Headquaters to talk to Uiharu, who tells them that for the past few days, bank cards were dropped all around the city. As a result, many people gather in the alley to go 'treasure-hunting', which raises the concern that some may fight over the cards. Kuroko apologizes to MIkoto for no longer being able to shop with her, to which Mikoto wink and brushes Kuroko off. As she is walking to the Shopping District, she finds Saten on all-fours and literally sniffing around for the bank cards. An excited Saten drags Mikoto off for a hunt, lasting until the sun started to set. Eventually, Saten thanks Mikoto for helping and leaves Mikoto with four envolopes of bank cards. But as she's standing there, she overhears four thugs talking about the origin place of the bank cards and their plan to raid it.
The scene cuts to the four thugs entering the room and taking away the bank cards from Shinobu, the person distributing the cards. With a series of psychological games she plays with the thugs, she makes them all faint with shock. Mikoto watches from the doorway and applauds Shinobu for her actions, telling her that she would've intervened if the situation got out of hand. The chapter ends with Shinobu looking at Mikoto and saying "So, you are the original".
- Critical - Nunotaba Shinobu