Both the JAAF and JNAF approved its design and construction and a prototype was built. In December 1944, the MXY8 was completed and, on 8 December 1944, at the Hyakurigahara Airfield, Lieutenant-Commander Toyohiko Inuzuka took the controls of the MXY8. Once in the air, Inuzuka found the MXY8 almost perfectly emulated the handling characteristics of the "Komet". Two additional MXY8 gliders were constructed in the naval yard at Yokosuka, one being delivered to the "Rikugun Kokugijitsu Kenkyujo" (JAAF Aerotechnical Institute) at Tachikawa for evaluation. The JNAF initiated the construction of another prototype, production designation Ku-13. This was to use water ballast to simulate the weight of an operational J8M complete with engine and weapons. This variant was to be built by Maeda Aircraft Institute, while the JAAF version was to be constructed by "Yokoi Koku KK" (Yoki Aircraft Co). The JNAF also proposed a more advanced trainer, designated the MXY9 "Shūka" (秋火, "Autumn Fire") which would be powered by a thrust Tsu-11 ducted-fan engine. The war, however, ended before this model could be built.