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The {{Nihongo|'''Kouga School'''|甲賀の系統|Kōga no Keitō|lit. "System of Kōga"}} is an organization of [[ninja]]{{TrackTag53|s}}s that is part of Japan's "darkness", but now operate globally.<ref name = ShinyakuV4Sub9>{{Qvl|Shinyaku|L|4}}{{TrackTag99}} Sub.09</ref>

==Principles==
{{Expand|Practices, training, techniques}}
==Background==
[[File:Kouga school.jpg|thumb|180px|right|Oumi Shuri teaching young ninjas, among them Tsurigane.]]
The Kouga have been operational in the shadows for a long time and have managed to continue doing so even into the 21st century. However, due to changing times, members of the school feel that they are nearing their limit. As such, they seek to obtain the means to develop genuine supernatural powers for the Kouga. However they are divided over how to accomplish this. Some of them believe that it would be faster to infiltrate [[Academy City]] to analyze supernatural powers with a certain faction having done so. Others don't wish to get so close to Academy City, not willing to submit to them for their leftovers, instead looking to investigate other factions.<ref name = ShinyakuV4Sub9 />

Around nine [[Years Ago|years prior]] to the [[main story]], the Kouga selected a six year old [[Tsurigane Saryou]] (an orphan who had joined the Kouga after being saved by Oumi Shuri from mountain dogs) to infiltrate Academy City under the guise of a [[Child Error]].<ref name=RailgunCh101/><ref name=RailgunCh106/><ref name=RailgunCh113>{{Qcl|Railgun|113}}</ref><ref name=RailgunCh118>{{Qcl|Railgun|118}}</ref><ref name=RailgunCh129>{{Qcl|Railgun|129}}</ref>

==Chronology==
===Toaru Majutsu no Index===
====DRAGON Arc====
{{Main/DRAGON Arc}}
The Kouga are first mentioned by [[Sugitani]], who claims to be one of their descendants and considers them contemptible.<ref name = IndexV19Ch3Pt6>{{Qvl|Index|L|19}} Chapter 3 Part 6</ref>
<!--{{Quote|That’s an organization of contemptible people who did things like this under the name of justice since ages past.|Sugitani's view on the Kouga ninjas|Toaru Majutsu no Index Light Novel Volume 19}}-->
===Shinyaku Toaru Majutsu no Index===
====Baggage City Arc====
{{Main/Baggage City Arc}}
When the [[Science Guardians]] held the [[Natural Selector]] tournament, a group of Kouga ninjas infiltrated Baggage City with the intention of finding and obtaining a suitable supernatural power user to analyse for the sake of developing supernatural powers for the Kouga. This unit was caught in the crossfire between invading [[Academy City]] forces led by members of the [[Kihara Family]] and [[Gremlin (Norse)|{{DCp|Gremlin}}]], and was mostly decimated.<ref name=ShinyakuV4Sub9 />

===Toaru Kagaku no Railgun===
====Jailbreaker Arc====
{{Main/Jailbreaker Arc}}
In mid-October, a team of Kouga ninja led by Oumi Shuri infiltrated Academy City with help with Tsurigane and on her recommendation, participated in the [[Second Reformatory]]'s [[Jailbreak Trial]] for the sake of observing and acquiring technology (though Tsurigane's goal was to help break out her friend [[Shundan Kimi]]).<ref name=RailgunCh101>{{Qcl|Railgun|101}}</ref><ref name=RailgunCh106>{{Qcl|Railgun|106}}</ref> After the challenge, when Tsurigane revealed her true colors and they learned of the [[Dark May Project|circumstances]] behind her apparent change,<ref name=RailgunCh106/><ref name=RailgunCh114>{{Qcl|Railgun|114}}</ref> Oumi decided as a senior ninja that Academy City's technology and techniques were something they should never touch again.<ref name=RailgunCh114/>

==Members==
*[[Sugitani]]
*[[Oumi Shuri]]
*[[Asai]] ''(deceased)''
*[[Sakata]] ''(deceased)''
*[[Yasu]] ''(deceased)''
*[[Tsurigane Saryou]] (defected)

==External Links==
*{{W|Kōga-ryū|Kōga (Wikipedia article)}}

==References==
{{Reflist}}
[[Category:Factions and Organizations]]
[[Category:Ninjas]]
[[Category:Kouga School|  ]]