Salaryman Kintaro
Kintarō Yajima used to be the leader of a feared and respected biker gang, but out of respect for his late wife he chooses to straighten himself out and work as a salaryman so that he can support his son.

Disaster strikes when the tunnel starts to cave in. Kintaro has to act quickly to save the tunnel and the workers trapped inside, before it collapses.