Paying The Check and Tipping
Checks are frequently shared among friends or even on dates in Japan. The term for this is betsu-betsu.
Men normally offer to pay a little bit more because their bills are usually higher because restaurants rarely issue separate checks, so this is how people generally work it out.
Actual amounts are rarely calculated; instead, people tend to use approximations. Frequently, a senior participant in your group will pay monthly Splitting the cheque is unacceptable in professional settings. Typically, the business that is selling the item pays. It's usual to pretend to want to pay by fighting for the check when someone pays with cash. You shouldn't take this seriously. If your client decides to pay, your chances are slim.
In Japan, tipping is not customary. The best course of action is to provide a small gift or covertly offer some money in an envelope if someone has been especially helpful.