Miyafuji Yoshikas father invented Striker units for the aircraft used by the Strike Witches in their battle against Neuroi. He was also the first test pilot for this development. His own magically gifted daughter, until recently, did not know about his involvement because he disappeared without a trace when she was 10 years old. The laboratory where he made the development exploded and it is believed that he too perished in the accident. His life motto emphasized using one's self-given power to protect others, which has influenced his daughter deeply.