It's the 70th anniversary of World War II, and this question came about when I started thinking about the anti-Japanese sentiment that is deeply embedded into China, Korea, and other East Asian countries, even today. Germany doesn't seem to have this problem (at least not that I know of, and at least not with America), and I would like to know how Germany took steps to heal the wounds of World War II and the Holocaust. I would also like to know how this compares to what Japan has done (or hasn't done) to mend its relationship with its neighboring countries.
After checking the rules, I will address Japan as best I can. Full disclosure, I live in Korea and I think the Japanese government's position on this issue is horrible, but I love spending time in Japan.
This article from Foreign Affairs pretty much answers your question. The Japanese ignore their conquests of Korea, Manchuria, and China and the enslavement, human experimentation, rape, arson, and murder that it entailed. Instead, they tell a tale of American imperialists and atomic bombs where Japan is the victim.
Japan has apologized many times, but the issue is more one of sincerity.
In Korea, one of the most important apologies was the Kono Statement. On the topic of forced prostituation, euphemistically called "comfort women", the Chief Cabinet Secretary Yohei Kono stated that:
Undeniably, this was an act, with the involvement of the military authorities of the day, that severely injured the honor and dignity of many women. The Government of Japan would like to take this opportunity once again to extend its sincere apologies and remorse to all those, irrespective of place of origin, who suffered immeasurable pain and incurable physical and psychological wounds as comfort women.
The problem now is that the current Prime Minister, Shinzo Abe, likes to hint that he might "revise" or repeal the Kono statement, that the issue needs more study.
Just last week on the 70th anniversary of the Japanese surrender, Abe gave a speech. Here is a great analysis by a Korean lawyer on the "dog whistle" issue of the speech; the code words that Abe uses to sound sincere to non-Asians, to appease his base at home, yet still offend Korea and China.
TLDR - Japan apologizes as infrequently as it can and it uses roundabout language in an attempt to evade taking responsibility for its actions in Asia between 1894-1945.