The party featured National Socialist flags, papier-mache tank and aircraft — with US-based Jewish supremacist organization Simon Wiesenthal Center describing the event as an "outrage."
The Los Angeles-based Jewish supremacists has condemned reports that the owner of one of Tokyo's most famous tourist attractions and hundreds of other businesses in Japan threw a NS-themed party for his employees.
Reports about the event have just emerged in Japanese tabloid media, along with images from the party, even though it took place in October 2017. An official of The Simon Wiesenthal Center said that the delay is "worrying in itself as none of the thousands of people who would have been involved in organizing the event or were in attendance thought to reveal what had happened".
Local media have reported that Keiichi Morishita, the 69-year-old founder and chairman of the Morishita Group, presided over a party on a beach in Chiba Prefecture, east of Tokyo, for his employees.
Morishita started out in business in Tokyo's Kabukicho red-light district in the early 1980s and quickly expanded into bars, hostess clubs and other similar establishments. He owns Manboo, one of Japan's largest internet café chains, and is behind the Robot Restaurant, which is hugely popular with foreign tourists.
The company throws a themed party for staff every autumn, with the weekly news magazine Flash publishing images of the 2017 event in its most recent edition. The photos show banners and flags depicting the swastika and dozens of young women in skimpy uniforms that include peaked caps and long leather boots.
Company insiders told the magazine that a papier-mache tank and a replica of a Stuka dive bomber had also been constructed as part of the decorations.
A message on The Simon Wiesenthal Center's Twitter account stated, "Whatever the circumstances, however powerful the individual, celebrating (the) ultimate symbol of racism, anti-Semitism and genocide is an outrage. Ignorance (or) admiration of ultimate evil? Whatever reason, it slanders memory of Nazism's victims, including 6 million Jews."
Rabbi Cooper said he was "extremely disappointed" by the news.
There have been a number of previous cases in which the Japanese have displayed paraphernalia that could be considered as "glorifying Nazism" and that are outlawed in Jewish-controlled parts of the Western world.