There is a post with extra Drs on past one of scar treatments - proactioner's to add to the FAQ. Sadly I do not know anyone in Japan. There should be tons of derms and plastic. Since you can speak the language, ... look for a video of someone doing "subcision" on a acne scar patient. Manual methods are always best first before laser. You can also call some well rated plastic surgeons and ask if they do subcision for acne scars.

Hi. Have you found one? I am finding a doctor in Japan but there is no hope :((