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"August 15, Part 4" (八月十五日④ Hachi-gatsu Jū-go-nichi ④?) is the 24th chapter of the Toaru Kagaku no Railgun manga series, released on August 27, 2009.


The chapter opens with a flashback to a conversation between Shirai Kuroko and Misaka Mikoto, in which the former asked the latter what she would do if she met her own clone. Mikoto answered, with a smile, that she'd feel sick and want the clone to disappear from her sight.

Back to the present, Mikoto rushes towards Accelerator and attacks him, but is easily repelled. Mikoto is at first concerned, but then seeing Misaka 9982's leg on the floor, screams again and attacks him with numerous magnetized rails. Accelerator repels the rails towards Mikoto, which she dodges, and then he realizes this Mikoto is the original one. He says that fighting her should speed up this program and approaches her. Mikoto demands to know his motivation to participate in this program if he was already so strong, to which Accelerator replies that he wants 'absolute power', a power that makes other people laugh at the thought at fighting him.

Mikoto is disgusted at Accelerator's response and fires off her railgun at him, which he deflects once again. Disappointed that this is all she has, Accelerator starts advancing towards Mikoto, but is stopped by other Sisters, who tell him that the calculation might be thrown off if he fights against Mikoto. Accelerator introduces himself to Mikoto and then walks away. Mikoto's knees give out from fear. As the Sisters prepare to clean up the battlefield, Mikoto shouts at them, asking why they are willing to participate in this program. They reply that they are merely lab animals.

Adapted To


By order of appearance:

New Characters

  • Multiple Sisters, ranging from 9995 to over 10008.


New Abilities

No new abilities were introduced in this chapter.


New Locations

No new locations were introduced in this chapter.



Cultural References

Unanswered Questions




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Toaru Kagaku no Railgun
Volume 1 1234567
Volume 2 8910111213
Volume 3 141516Sp17Sp1Sp2
Volume 4 181920212223
Volume 5 24252627282930
Volume 6 31323334353637
Volume 7 3839Sp4041424344
Volume 8 4546474849505152
Volume 9 535455565758596061
Volume 10 626364656667686970
Volume 11 71727373.5747576777879
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Volume 13 8990919293949596
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Volume 15 107108109110111112113114115
Volume 16 116117118119120121122123124125126127
Volume 17 128129130131132132.5132.75133134135136
Chapters Not Yet in Volume Format 136.5137138139140
Special 17.524.525.542.596.5122.5