[2][3][4] In 1945 during World War II, his family escaped from the air raids in Osaka and evacuated to Meiji, Minamiamabe District, Oita Prefecture.

In December 2013, Nakaima approved a landfill proposal by the Japanese government to permit the construction of new military facilities in Henoko to replace Marine Corps Air Station Futenma.

[5] The decision came two days after Tokyo earmarked 348 billion yen for Okinawa's economic development and despite earlier campaign promises by Nakaima to move the base outside of the prefecture altogether.

[6] On May 10, 2014, Nakaima sent his congratulations to the openly revisionist lobby Nippon Kaigi for a sport event it held in Okinawa.

Onaga opposed the plan to move the Marine Corps Air Station Futenma base to Henoko Bay, while Nakaima supported it.