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


The Judgment Boy is a tall boy with short spiky slicked back hair.[1]


Toaru Kagaku no RailgunEdit

Level Upper ArcEdit

Main article: Level Upper Arc

During the Graviton bombings, the Judgment Boy arrived with Konori Mii at a shop where Judgment detected residue of a potential bomb. While searching for the bomb, he noticed the Twin Tails Girl who fell and hurt her leg within the shop. While running over to assist her, a nearby stuffed rabbit which had been infused with gravitons started to explode. He quickly jumped in front to cover the Twin Tails Girl and after the explosion was seen with a large wound on his back.[1][2]

Sisters ArcEdit

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

The boy in casual clothes with the Twin Tails Girl

On August 20, while Saten Ruiko and Uiharu Kazari walked by a shop, the Judgment Boy was seen in casual clothes and on a potential date with the Twintails Girl he was previously seen saving.[3]

Daihasei Festival ArcEdit

Main article: Daihasei Festival Arc (Railgun)
Judgment Boy and Twin Tails Girl Dancing

The boy dancing together with the Twin Tails Girl

While Misaka Mikoto and Kamijou Touma were dancing around a bonfire, the Judgment Boy and Twintails Girl were seen dancing together behind them.[4]

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.[5] It is later cut-off in the finished cover.



Kuroko Shirai Uiharu Kazari Konori Yanagisako Aomi
Shirai Kuroko Uiharu Kazari Konori Mii Yanagisako Aomi
Template Placeholder other Kihara Nayuta Judgment Girl (Astral Buddy) Judgment Boy (Railgun Anime)
Yotsuba Kihara Nayuta Makigami Komaki Judgment Boy
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