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Last checked: June 16, 2017
Tenkamusou Edajima Heihachi Den is a prequel to Sakigake!! Otokojuku which focus on the life of Edajima Hirayatsuden. It was published in Super Jump from 2003 to 2010 ending in ten volumes.
The story focus on the life of one of the main characters in Sakigake!! Otokojuku, Edajima Heihachi, covering his university days, his war efforts, and much more about this mysterious man among men.