The Twin Tails Girl is a recurring background character in the Toaru Kagaku no Railgun manga. She always appears with the Judgment Boy and acts as an easter egg in the series. She has appeared in 3 chapters of the manga.


The Twin Tails Girl is a short girl with long hair tied into twin tails.[1]


Toaru Kagaku no RailgunEdit

Level Upper ArcEdit

Main article: Level Upper Arc

During the Graviton bombings, the Twin Tails Girl fell and hurt her leg within a shop which Judgment was searching for a potential bomb. The Judgment Boy heard her fall and ran over to assist her as a nearby stuffed rabbit which had been infused with gravitons started to explode. She made it through the explosion unscathed as the Judgment Boy jumped in front of her and was seen with a large injury on his back.[1][2]

Sisters ArcEdit

Main article: Sisters Arc
Judgment Boy and Twin Tails Girl Date

The girl in casual clothes with the Judgement Boy

On August 20, while Saten Ruiko and Uiharu Kazari walked by a shop, the Twin Tails Girl was seen in a dress and on a potential date with the Judgment Boy who previously saved her.[3]

Daihasei Festival ArcEdit

Main article: Daihasei Festival Arc (Railgun)
Toaru Kagaku no Railgun T E14 21m 56s

The girl dancing together with the Judgment Boy cameo (see left of Uiharu)

While Misaka Mikoto and Kamijou Touma were dancing around a bonfire, the Twin Tails Girl and Judgment Boy were seen dancing together behind them. In the anime, this is the second time they appeared.[4][5]

Dream Ranker ArcEdit

Main article: Dream Ranker Arc
Toaru Kagaku no Railgun v12 full background cover

A Gekota cosplayer took picture of the Twin Tails Girl and the Judgment Boy.[6] It is later cut-off in the finished cover.


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