Just like in many asian countries, they profile people. If you are African and look poor, they'll ask you for your return ticket and "show money". If you're white, you shouldn't have any problems. If you are light-skin asian, who look japanese, be sure to cover your tattoo. A japanese passport and a dragon tattoo on your back is usually enough to deny you entry.
11

toban60
"Dragon tattoo on your back"
Ha,ha,ha,ha
Do many people go through passport control with their shirts off and walking backwards????
Ha,ha,ha
Also, if you're Japanese wear gloves so they won't see the 4 fingertips missing, cut off because you screwed up with the Yakuza.
ha,ha,ha,ha
Ok, no joke, your point is well taken, thank you.
Pro tip
