How does an American get a good job in Japan; not teaching English?

I have 4 years of work experience and a four year degree. I can speak conversational Japanese. Where can I find a good job in America that will send me to Japan? Are there agencies or head hunters that can help? I've been looking for four years and have only found jobs teaching English. Are there jobs out there that someone can land with an Economics degree and experience in business/management from a top company?

Try Citigroup (Japan division). Citigroup recently bought out Nikko Securities, so maybe you'll find something.