Moriya was implicated of accepting bribes in the Yamada Yoko Incident, and was compelled to sworn testimony before the National Diet.

[2] Moriya graduated from Tohoku University, briefly working for Nippon Express and joined the Defense Ministry in 1971.

[3] After becoming involved with the ministry's affairs, Moriya held a series of key posts including becoming the head of the Defense Policy Bureau.

Moriya would become entangled in a major corruption scandal concerning the acquisition of equipment for the Japanese Self Defense Forces.

[5] Koike blamed leaks in the Defense Ministry and a nascent corruption scandal concerning the acquisition of transport aircraft on Moriya, arguing that his administration of the agency had created "institutional scoliosis" [5]