Whakaotihia te rerenga e whai ake nei: I tohaina ki te Imperial Japanese Navy General Staff hei Tumuaki o te Wahanga Whakahaere i te Oketopa 1940, i haere tonu a Tomioka ki te mahi i taua kaha i roto i nga tau tuatahi e rua o te Pakanga o te Moananui a Kiwa, i te wa i whakaekea ai e ia te whakaeke ki Pearl Harbor. I tino whakahe hoki ia ki ngā mahere a Admiral Isoroku Yamamoto mō te
Ko te mahi i waenganui, e whakaaro ana kia noho a Hapani ki nga roopu moutere nui ake o Fiji me Samoa. I akiaki hoki a Tomioka kia arotahi ki te nohoanga o Port Moresby i New Guinea, hei waahi mo te whakaekenga o Ahitereiria, hei kukume ranei i te kaipuke kaipuke Amerika mai i ona turanga kaainga. I whakakahoretia ia i te wā i whakawehi a Yamamoto ki te whakarere.