Unlike iconic singer Tom Waits, raw milk is not “Big in Japan”. However it does seem to be legally available there, though expensive. According to Paul Ericson, who was recently in Japan, raw milk, which is supplied from only one dairy in the entire country, is distributed through perhaps 50 retail outlets scattered throughout Japan.
At any given grocery, there will be a dozen different types of milk, varying in things like butterfat content and % of fresh milk vs powdered. On pasteurized milk, the pasteurization time and temperature are indicated on the package. Much of the milk in Japan is ultrahigh temperature (UHT) pasteurized. And while pasteurized milk costs 140 yen for 500 ml, raw milk costs about 6 times as much, 385 yen for 180 ml.
Here is a link to the website of the one raw milk dairy in Japan. Note: this is in Japanese, so you’ll need to be able to display Kanji characters on your system and be able to read Japanese to see what it says. Good luck with that. Thanks to Paul for this intelligence.