Aoki is a character never shown on screen.
In "The Last Kamikaze", Japan begins sending out some 4000 Kamikaze on suicidal attacks on Allied fleets in October 1944. Aoki is the navigator of Kamikaze pilot Kuroda. Before diving, Kuroda hesitates, misses a ship he is targeting, and crash-lands in a Pacific jungle island near to the Philippines.
Aoki soon commits Seppuku.