Brief History of Glorantha RPG in Japan
I suppose there are many Japanese fan Glorantha materials beyond my grasp, below is a brief history of Glorantha RPG in Japan what I know.
Last Updated: 2009/02/11

YearJapanUnited States of America
1978 #RQ First Edition# published from Chaosium ?(Legend)
1979 #RQ Second Edition# published from Chaosium
1982#RuneQuest# firstly introduced to Japan in "Tactics" Magazine, 1982/07 by Mr. Takanashi Shunnichi, Supplements imported by "Hobby Japan" Inc before the Third Edition was translated. 
1984[No Translated Version, but Small Core fans can read English and forms first community (like Mizuno Ryo in "Tactics Magazine") supporting Glorantha enthusiastically]#RQ Third Edition# published from Avalonhill, it based on "Fantasy Europe" Setting, not Glorantha. Its last supplement is #Lord of Terror#(1994)
1988Japanese Version #RQ Third Edition# published from "Hobby Japan" Last translation is #King of Sartar#(1994).
Translation List is below:
  1. #RuneQuest# 1988/08/01
  2. #RuneQuest Advanced Rulebook# 1988/11/15
  3. #RuneQuest Companion# (Fan Booklet from "Tactics" magazine) 1988/11/15
  4. #Gods of Glorantha# 1990/01/06
  5. #Snakepipe Hollow# 1990/08/13
  6. #Elder Secrets of Glorantha# 1990/10/29
  7. #Trollpak# 1993/01/17
  8. #Sun County# 1993/06/21
  9. #River of Cradles# 1993/10/31
  10. #Monster Colloseum# 1994/08/19
  11. #King of Sartar# 1994/08/?
 
1990"Tactics" magazine renamed to "RPG magazine", and changed to spot on Tabletalk RPG, its first article is a short story of RuneQuest, written by Mizuno Ryo. This Magazine supports long RuneQuest line, even after RQ publishing from "Hobby Japan" is stopped.  
1992#RuneQuest 90th# published from "Hobby Japan" it focuses on Glorantha, rule and settings compactly collected from various Avalonhill 3rd Edition Rulebooks 
1993#Dragon Atlas#, Gazetteer for RuneQuest 90th published from "Hobby Japan", it is based on Genertela Boxed Set but focuses on Dragon Pass Area with some original setting 
1993 #King of Sartar# published, Greg begins DeGodlearnization and changes
1994Japanese Edition #King of Sartar# (With Japanese Title #The Chronicle of Glorantha# published from "Hobby Japan" (though it isn't Game Material) "Hobby Japan" stops the support of RQ line [But it makes some fans like TI (the writer of this document) completely enchanted and begin to live in Glorantha.] 
1994`1999[RPG Magazine continues support RQ before it changed to spoting on Trading Card Game like "Magic the Gathering". From 1995 To 1996, #Rune Warriors# articles printed six times, it is a sort of live action which editors gathering non-electorical mail from readers' actions, using 17th Century Setting of Dragon Pass.]#RuneQuest 4th Edition# never published, RuneQuest and Glorantha divided. Dark Age. Still fanzines like #Tales of the Reaching Moon# from "Reaching Moon Megacorp" and #Glorantha Digest# support the community firmly
1999[TI played, played and played #KODP#, bothered David Dunham several times in #KODP# mailing list.]Computer Game #King of Dragon Pass# from "A.Sharp" released
2000 #HeroWars# published from Issaries, completely different rule from #RQ#, focused on social status and magic
2001Greg Stafford visits Japan with the event of #HeroWars Japanese Edition# published from "Atelier Third" [Atelier Third stops HeroWars publication after this book] 
2003 #HeroQuest 1st Edition# published from Issaries
2006[Some Japanese Core Fans begin to play #RQ Third Edition# with MRQ supplement rules and settings]RuneQuest and Glorantha marry again. Mongoose begins #RuneQuest# line, ill-balanced rule, but it includes some of Greg Stafford's Material and supports mainly Glorantha
2006`2009Japanese Rule Valiant, #RuneWars# (based on #HeroWars# and #HeroQuest# rules) used and supported by community with Wiki #HeroQuest 2nd Edition# scheduled