After a Japanese billionaire posted a plea to find a girlfriend, 20,000 people got in touch.

Yusaku Maezawa will be the first private passenger on Elon Musk's SpaceX, and is looking for a "life partner" to take on his moon voyage.

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Streaming service AbemaTV is releasing a documentary on his search for a partner called "Full Moon Lovers".

The show's application site includes a "love diagnostic test" where potential entrants can test their compatibility with the entrepreneur, who sold his online fashion business Zozo Inc to SoftBank Group Corp last year.

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Multiple-choice questions include "If you rode in a private jet where would you go?" and "If Maezawa farted in front of you what would you say?", with users presented with a photo of the billionaire varying from happy to sad depending on their score.

Maezawa has already generated huge social media buzz with a $US9 million ($A13 million) giveaway to his followers that secured his position as Japan's foremost Twitter celebrity.

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AbemaTV, backed by online ad agency CyberAgent and broadcaster TV Asahi, is one of Japan's foremost proponents of the reality dating show.

Securing Maezawa for "Full Moon Lovers" is a coup for the service, which aims to generate social media traffic and is targeting younger viewers who are turning off TV.