He's a former member of the elite group known as the Aggressors. Later, he became the commander of a PT force that's located near the Far Eastern Base. His ranking is a Major. He's married and also has a daughter. He's known to be very strict, and was called a demon instructor by Masaki, who broke the rules and sortied on his own. As a result, Kai made him sit perfectly straight for several hours after that incident.