People don't tip in Japan. You shouldn't either. It may feel strange — particularly since Japanese service is amongst the best in the world. Resist the urge — it's rude to tip.
Travel Karma
If you tip in Japan — you're imposing the customs of your country where they don't belong. It's bad travel karma.
Practical Concerns
People may get confused if you tip them. They may run after you with your change.
If your server does understand it's a tip — they might not know how to pay taxes on it. They may feel the need to report the incident to their employer. Worse, they may take it as an insult.
Tipping is overrated
You'll quickly become accustomed to not tipping in Japan. You may even learn to like it. It means that any waiter / waitress in the restaurant can help you. It also makes paying the bill far simpler.
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