sentences:  The development of the aircraft began at the end of 1937 at the request of the Japanese military high command.Kawasaki received an order to develop a "high-speed bomber" capable of 480 km/h (300 mph) at 3,000 m (9,840 ft), and able to reach 5,000 m (16,400 ft) within 10 minutes.It was inspired by the Soviet Tupolev SB.