Miyafuji Yoshika's father is the inventor of the Striker units of that aircraft, which bring the Strike Witches in their fight against the Neuroi used. Mio Sakamoto was the first test pilot for this development. His own, also magically gifted daughter, until recently, however, knew nothing of his involvement, since he disappeared without a trace, when she was 10 years old.
In the laboratory, in which the professor made his development, then passed through an accident that destroyed the entire building and it is believed that he too was killed in this explosion. His life motto was that you should use a self-given power to protect others, a theme that has internalized his daughter.