Kouga School

The Kouga (甲賀の系統) is an organization of ninjas that is part of Japan's "darkness", but now operate globally.

Background
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.

Around nine 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.

DRAGON Arc
The Kouga are first mentioned by Sugitani, who claims to be one of their descendants and considers them contemptible.

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, and was mostly decimated.

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). After the challenge, when Tsurigane revealed her true colors and they learned of the circumstances behind her apparent change, Oumi decided as a senior ninja that Academy City's technology and techniques were something they should never touch again.

s

 * Sugitani
 * Oumi Shuri
 * Asai (deceased)
 * Sakata (deceased)
 * Yasu (deceased)
 * Tsurigane Saryou (defected)