They were saving planes for the US invasion of Japan. When they surrendered the Japanese actually possessed some 12,700 aircraft in the Home Islands, roughly half kamikazes.
“Replace.” They couldn’t replace planes. Or ships. And they never would be able to do so.
Imperial Japan had run out of gas. Literally. They hadn’t the fuel to continue the war, they hadn’t the pilots, and they weren’t going to be getting off the ground, which even kamikaze pilots require.