With Allied Forces getting closer and closer to the homeland of Japan during World War II the Japanese military turned to various methods of self-sacrifice to combat the Allied forces. The MXY-7 Ohka (Cherry Blossom) was one of those weapons.
Essentially this weapon was a human guided cruise missile in which it would be carried aloft by a mothership, typically a G4M Betty Bomber, and then released within sight of the enemy naval fleet. The rocket powered craft would hurdle towards its target with a 2,600lb warhead and a pilot behind the stick with the hopes of hitting a target.
Being late in the war Japan was losing its skilled pilots rapidly, and with this particular one use aircraft, Japan would need to be able to train new unskilled recruits in the art of flying very quickly. It was hoped to give the inexperienced pilots some basic knowledge of the craft in which they were going to fly in, so they created the MXY7-K1 2 seat trainer.