Remember that relationships and trust are of paramount importance.
While these are virtues in many cultures, they are of utmost importance in Japanese business relations,
arguably more so than efficiency, contracts, pricing, etc. It pays hugely to invest in relationship-building
Learn about gift-giving (omiyage) rituals.
Gift-giving is another long-standing and highly ritualized custom in Japan. Definitely take the time
to research what kinds of gifts and presentation of gifts are appropriate for your business partners.