Longshot is correct. Looks like something interesting happened to Honda between 3rd and 4th Edition.
I guess I'm not that surprised; it's hard to survive as an A-rated corporation. Plus, if Chrysler-Nissan can end up in bed together then why not GM-Honda. Modern day Honda has, what, 30 or 31 manufacturing plants, of which only 6 or so are actually located in Japan. Even if Ares lost Honda HQ and the assets in Japan, they'd still come away with a significant portion of the manufacturing capacity.