Both matter for serious Japan-market sellers, but they reach different customer segments and require different operational approaches.
Rakuten's customer base skews toward loyalty-program-driven repeat shoppers within its point ecosystem; Amazon Japan customers often behave more like Amazon shoppers globally — convenience and speed-focused.
Rakuten generally requires more hands-on store management and merchandising than Amazon's more standardized seller experience.
For most brands seriously targeting the Japanese market, both are worth pursuing eventually — but new entrants with limited resources often see faster initial traction on Amazon Japan given its more standardized onboarding.
For many categories, yes, though it's typically a lower priority than establishing Amazon and Rakuten presence first.
Yes, typically — though inventory management tools exist to help sync stock levels across multiple marketplace listings.
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