"We, the unemployed, are the frogs of the world. We, the unemployed, live in the world of frogs. We live in the shadows, crawling through the rain and sand."

Kotetsu, a poor renter of horses, had been unable to become even a subordinate of the three lowest-ranking yakuza because he had been rejected by the authorities wherever he went.

However, he met a beautiful blind woman named Osen by chance on a trip and fell in love with her. With her guidance, Kotetsu jumped into the world of yakuza and quickly crushed the Kuroba family, took over their territory, and established the “Kotetsu Family” to expand his power.

This is the story of the rise of a yakuza gangster who later became infamous in Sekihachishu as "Bikki no Kotetsu"!