One employee who survived the fire told NHK he did so by jumping from the second-floor balcony.
The employee, who was not identified, told the broadcaster there was a loud explosion and a plume of black smoke came up through a spiral staircase, filling the second floor and making it hard to breathe. As he went to the veranda, he heard cries for help.
“It was a choice of jumping from the second floor and getting injured, or dying,” he told NHK, adding that there were employees who could not bring themselves to jump.
Aoba lived in a small, two-floor apartment building 500 km (310 miles) from the western city of Kyoto, Japan’s ancient capital, on the outskirts of Omiya, a commuter hub north of Tokyo.