From what’s known, it was basically Japan’s early attempt at a domestic air-to-air missile, heavily influenced by (or derived from) the AIM-4 Falcon. It didn’t really progress far or see widespread use, which is probably why info is so limited.I found a few things within the forum and in a Google search I found nothing beyond the Wikipedia article with superficial information; it's an interesting project since it was based on the AIM-4 Falcon.