1985 Team founded by members of the Fuji Xerox Osaka group.
1989 Joined the X-League.
2010 Promoted from X2 to X1 for the following season.
2011 Finished 6th in the West Division (0 wins, 7 losses). Lost X2-X1 replacement game to the Hankyu Bruins 5-25. Demoted from X1 to X2 for the following season.
2015 Due to the Nishinomiya Bruins finishing 0-2 in the Green Bowl Spring tournament, the J-Stars were promoted to X1 for the Fall tournament. Finished 6th in the West division (0 wins, 7 losses). Lost X2-X1 replacement game to the Sidewinders 10-17. Demoted to X2 for the following season.