Two years after the events of Kengan Ashura, a young man named Narushima Kouga aims to enter the Kengan matches, seeking Tokita Ouma for a yet unknown reason. He begins working under Yamashita Kazuo after meeting Gaou Ryuuki, who is a spitting image of Ouma. With a massive showdown between the Kengan Association and Purgatory, another underground martial-arts fighting organization, looming in the background, how will Kouga become strong enough to enter the legendary Kengan fights?