Murakami is best known for his work in New Japan Pro-Wrestling (NJPW) during the late 1990s and early 2000s, where he primarily competed as a member of the villainous Makai Club stable.

After leaving NJPW in the fall of 2004, Murakami subsequently competed for Pro Wrestling ZERO1-MAX (ZERO1-MAX) and Big Mouth LOUD, of which he was a founding member.

He met Wajyutsu Keishukai founder Yoshinori Nishi, who convinced him to join his team, and Murakami started his career in mixed martial arts.

A few months later, at EF4: Extreme Fighting 4 on March 28, 1997, Murakami lost to future UFC Heavyweight Champion Maurice Smith by KO.

Murakami entered professional wrestling in 1998 when he joined Antonio Inoki's Universal Fighting-Arts Organization alongside fellow judoka Naoya Ogawa.

They were sent to New Japan Pro-Wrestling, where Murakami initially gained fame for attacking wrestlers while sporting a white mask, becoming known as "The Terrorist of Heisei".

He finished fourth in his block with 5 points scoring victories over Nakanishi and Tadao Yasuda while going to a double countout with eventual winner, Yuji Nagata.

[9] In the fall of 2003, Murakami began competing in a series of three "bounty" matches, where the winner would receive a cash prize from Makai Club leader Kantaro Hoshino.

His last match under contract to the promotion took place on July 7, where he, Katsuyori Shibata, Super Strong Machine, Mitsuya Nagai and Masahiro Chono defeated Hiroyoshi Tenzan, Osamu Nishimura, Shinya Makabe, Yuji Nagata and Yutaka Yoshie.

[2] He also debuted for Pro Wrestling Noah, taking part in a tournament for the GHC Tag Team Championship alongside Shinjiro Otani.

On January 4, 2021 at Noah New Sunrise 2021 Sugiura-gun (Kazunari Murakami, Kazushi Sakuraba & Takashi Sugiura) defeat Kongoh (Katsuhiko Nakajima, Kenou & Masa Kitamiya) by referee's decision.

On January 16, 2021, at Noah Higher Ground 2021 - Day 2 in another six-men tag team match Sugiura-gun (NOSAWA Rongai & Takashi Sugiura & Kazunari Murakami) defeat Kongo (Kenou, Manabu Soya & Tadasuke).