[JYoung]

My sources are as follows:

For OHZUMI
Koseisyo Engokyoku Gyomudai2ka [2nd Operations Division, War Victims’ Relief Bureau, Ministry of Health and Welfare], “Syowa 16 - 17 nendo Senshi (Junshoku) sya Tojoin Meibo”[List of Air Crew who were Killed in Action and Victims to Their Duties, Fiscal Year 1941-1942], a collection of Military History Archive, Center for Military History, National Institute for Defense Studies, Tokyo (here after refers as NIDS).

For MARUTA
Koseisyo Engokyoku Gyomudai2ka [2nd Operations Division, War Victims’ Relief Bureau, Ministry of Health and Welfare], “Syowa 16.12 – 20.9 Shibotsu (Junshoku) sya Tojoin Meibo[List of Air Crew who were Killed in Action and Victims to Their Duties, Dec. 1941 – Sep. 1945]”, a collection of NIDS.

Kaigun Kokuhonbu, [Air Headquarters, IJN], “Taisyo 3 – Syowa 20 Kaigun Koku Junsyokusya Meibo[List of IJN Air Crew who were Victims to Their Duties, 1914 – 1945]”, a collection of NIDS.

Best Regards,
JYoung