The church is known by the name of Setsuri (meaning Providence) in Japan, and has existed there for 15 years.
Japan probably has the second most number of JMS cult members, of around 2,000. That number came from a August 2006 Japanese news report, it's likely it fell quite significantly after media in Japan exploded in that month.
A youtube user has a Japan news video
. His translation says the woman in the video stated Jung wanted to move the base to Japan because Japanese women were easy to rape as he couldn't talk their language.