Danbooru-based image board with a specialization in high-quality images.
bikini misaka_mikoto swimsuits to_aru_kagaku_no_railgun to_aru_kagaku_no_railgun_s to_aru_majutsu_no_index

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This is not Mikoto, it is "Last Order". That's what she's known as. She's clone #20001, and unlike all the others which were force-aged to be the same as Mikoto, Last Order was left as a loli.
Is this even a spoiler now?
Anyways, it IS Mikoto.
Drawn a bit awkwardly, but clearly not Last Order small, but Mikoto, also there's clear differences in facial structure too.
I think it's Last Order

Looks like this was cropped from another image though.
+ 1 for TheUnspoken: she's definitely Mikoto, not Last Order. I can even recognize a part of a Kuroko's twintail on the left edge.
Yes. First off, Kuroko is the same height or shorter by the looks, second, the swimsuit was Mikoto's, third, Last Order's child body doesn't let her those thin and long legs or upper body (so this ISN'T NEARLY as young looking as LO), and finally, Mikoto's face is different from Last Order's if you care to look closer, and this is Mikoto's face.
Please, if you don't know the character enough, don't mistag it as Last Order. It is Mikoto, not even one of the sisters, it is Misaka Mikoto herself.
Radioactive said:
I think it's Last Order

Looks like this was cropped from another image though.
Probably cropped by the copyright holders themselves though: https://twitter.com/xR4iLGuNx_Ix0s/status/471053305049645056

Edit: Stitching these to this image and you may get the whole thing:
http://www.suruga-ya.jp/product/detail/608900350001
http://www.suruga-ya.jp/kaitori_detail/608900352
http://www.suruga-ya.jp/kaitori_detail/608900348
TheUnspoken said:
Yes. First off, Kuroko is the same height or shorter by the looks, second, the swimsuit was Mikoto's, third, Last Order's child body doesn't let her those thin and long legs or upper body (so this ISN'T NEARLY as young looking as LO), and finally, Mikoto's face is different from Last Order's if you care to look closer, and this is Mikoto's face.
Please, if you don't know the character enough, don't mistag it as Last Order. It is Mikoto, not even one of the sisters, it is Misaka Mikoto herself.
Quoted for truth.
moonian said:
Probably cropped by the copyright holders themselves though: https://twitter.com/xR4iLGuNx_Ix0s/status/471053305049645056

Edit: Stitching these to this image and you may get the whole thing:
http://www.suruga-ya.jp/product/detail/608900350001
http://www.suruga-ya.jp/kaitori_detail/608900352
http://www.suruga-ya.jp/kaitori_detail/608900348
Waiting for the reassembled version... If it appears someday.