From Comikey:
“In the underground arena that will never see the light of day,
two beasts are facing off. Wishing upon their fists.
Two years after the events of Kengan Ashura,
a young man named Narushima Koga aims to enter the Kengan matches,
while also seeking out Tokita Ohma for a mysterious reason.
He begins to work under Yamashita Kazuo when he meets Gaoh Ryuki,
the spitting image of Ohma.
Now 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 take part in
the legendary Kengan fights?