A third-year student student at Kyosho Academy who launched an assault on Seito. She was given one of the Hyakuhekitō to use in battle, but her gang could not get past Kanshou. She tried to distract Kansho by flashing her shorts in front of him but he knocked her out instead, her own men attributing that she looked too boyish for that plan to have worked. Personality-wise, Soujin is a tomboy who easily loses her temper when insulted, especially when her feminity is concerned.