Inaba, the MVP of the Japan Series, drove in the winning run in the top of the sixth inning with a single to right that scored Hichori Morimoto from second.
Trey Hillman's team scored three more runs in the sixth to widen the lead with Yukio Tanaka, Shinya Tsuruoka and Toshimasa Konta each picking RBIs.
"It's been a while since we played so I was real pleased with the way we performed out there tonight," said Hillman.
The Fighters added two more runs in the top of the ninth.
Tomoya Yagi, who started for the Fighters and gave up one run on one hit, left the game in the fifth inning because of a sore left shoulder.
Takehiko Oshimoto, Yoshinori Tateyama, Hisashi Takeda and Michael Nakamura combined to hold the South Korean team scoreless the rest of the way.
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