My Japanese is a bit rusty. But let me give it a try. It says:
"He who tries to behold and admire his likeness in this looking glass will surely stumble. Even monkeys fall from trees."
Hey, I'm just joking!
Don't know Japanese at all. But I did send the pic to a Japanese friend and somebody else (Japan-based) who may help out. Let's see if they will be able to respond in time.
