Based on

Movies like Immortal Guy (1967)

Kosuke Suzuki was presumed dead after boss Toseikai Setouchi lynched him and threw him into the sea off the coast of Kobe. However, three months later, Kosuke suddenly appears in Kagoshima and reunites with his partner, the vagrant Kumagoro. However, Kosuke's relief does not last long, he learns from Kumagoro that Toseikai are acting ruthlessly here too.