Assailants in two cars reportedly blocked another on a Nagoya street and fatally attacked the driver with what appeared to be knives and baseball bats.
An employee at a convenience store in Nakagawa Ward called the police at about 1:30 a.m. Sunday, reporting that "a man covered in blood from head to toe" had entered the store, the police said.
The victim, who had sustained apparent knife wounds, was rushed to a nearby hospital but died of hemorrhagic shock about six hours later, the police said.