The Japanese have not been very aware of such things as the Holocaust. Right now, knowledge of it is not widespread. They're not all that aware of what Jews are, for that matter. Not are they too up on other atrocities, such as those committed by the Japanese during World War II.

However, there is an interesting phenomenon concerning Anne Frank. Her Diary is extremely popular in Japan. Extremely popular. There have been a number of adaptations of it in film, including anime plus a popular manga. In fact, there's a moment in the Diary where Anne writes frankly about getting her period. A maxi-pad company then came out with a line of maxi-pads called "Anne's Day" in reference to this, and "Anne's Day" became a colloquial way to refer to menstruation. Japanese people represent one of the largest nationalities to visit the Anne Frank House in Amsterdam each year, and there's even an imitation house in Japan that tourists can visit. But it doesn't really have a Jewish context. The emphasis is more on the suffering that children experience because of war. The Japanese identify with her suffering and victimhood, and make it their own suffering and victimhood in World War II/the Pacific War. Never mind that the Japanese were the aggressors--focusing on and identifying with a victim makes them feel more like victims. And many were victims--it's not like they voted for war, especially the children.

The point is that the Holocaust as seen in Japan is just one of the bad things that happen to people in war, and people in Japan might be vaguely aware of something, sort of like how a random American might be vaguely aware of Kurds, but Kurds don't have an important place in American minds so any action against Kurds is maybe something that sort of they covered in history, but that's about it. And Schindler's List likely occupies the same significance to them as Hotel Rwanda does to an average American.