Toaru Majutsu no Index Wiki
Toaru Majutsu no Index Wiki

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 Railgun[]

Level Upper Arc[]

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 Arc[]

Main article: Sisters Arc

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 Arc[]

Main article: Daihasei Festival Arc (Railgun)

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 Arc[]

Main article: Dream Ranker Arc

Toaru Kagaku no Railgun v12 full background cover.jpg

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