In 1998, Shiga teamed with Akira Taue in the 1998 Asunaro Cup tournament where they finished as the runners-up losing to Jun Akiyama and Takao Omori in the finals.
[7] On June 9, 1999, Shiga received his first title shot when he challenged Yoshinari Ogawa for the World Junior Heavyweight Championship but lost.
[3] In June 2000, Shiga left All Japan along with the majority of the native roster to Mitsuharu Misawa's new promotion: Pro Wrestling Noah.
Shiga debuted for Noah at their first show on August 5, 2000, where he teamed with Naomichi Marufuji to defeat Masao Inoue and Yoshinobu Kanemaru.
[9] After debuting in Noah, Shiga continue to remain in the midcard but would get more to participate in tournaments and title matches, by the end of 2000 he joined Jun Akiyama's stable: Sterness.
[10] On October 19, 2002, Shiga and Kobashi challenged Jun Akiyama and Akitoshi Saito for the GHC Tag Team Championship but came up short.
After two and a half years, Shiga returned to the ring at Noah's September 18, 2005 Nippon Budokan show where he lost to Tamon Honda.
He wrestled on their January 31, 2010 show teaming with Tamon Honda in a losing effort to GBH (Togi Makabe and Tomoaki Honma).