Tokuro Akamatsu runs a transport company. One day, a truck owned by Tokuro Akamatsu is involved in an accident. A tire came off the truck and killed passengers in another car. At first, Tokuro Akamatsu doubts that poor maintenance was the cause and he soon discovers a defect in the truck. Tokuro Akamatsu demands a reexamination by car manufacturer Hopu. The company moves slowly in their reexamination which causes Tokuro Akamatsu to investigate the issue by himself. He uncovers a truth that the Hopu is trying to hide.