Doi was originally groomed as the top face for T2P, but injuries forced him to debut in Japan late and his growth was slightly stunted.

The MO'z eventually split, with the heel faction of Kanda, Horiguchi, Gamma and YAMATO joining up with Shingo Takagi and Cyber Kong to form Real Hazard.

In August, he and Yoshino won the Summer Adventure Tag League Tournament for the second year in a row, and then a month later, on September 26, they captured the Open the Twin Gate Titles for a second time from Ryo Saito and Susumu Yokosuka.

Despite the huge size difference, he was able to defeat Akebono and retain the title, after hitting him with five consecutive Bakatare Sliding Kicks.

On August 24, 2010, Doi and Masato Yoshino won their third Summer Adventure Tag League by defeating Genki Horiguchi and Ryo Saito in the finals.

[2] On October 13, 2010, Doi turned on Yoshino and joined the former Deep Drunkers and Takuya Sugawara to form a new heel stable.

After being kicked out of Blood Warriors by new leader Akira Tozawa, Doi reunited with Masato Yoshino to form World-1 International.

[8] On August 5, 2014, Doi became the interim Open the Dream Gate Champion, when he defeated BxB Hulk in a four-on-one handicap match.

On August 16, 2015, Mad Blankey was forced to disband after losing to Jimmyz in a five-on-five elimination tag team match, after being betrayed by K-ness.

[10] On September 23, Doi formed a new stable named VerserK with Cyber Kong, Kotoka, Mondai Ryu, Shingo Takagi and Yamato.

[11] Doi and Yamato would hold the Open the Twin Gate championships until losing the titles to T-Hawk and Big R Shimizu on March 6, 2016.

On May 4, Naruki Doi reunited with Masato Yoshino and formed a new unit called MaxiMuM with Big R Shimizu, Ben-K, and Kotoka.

Doi became one half of the ROH World Tag Team Champions on March 3, 2007, with Shingo, beating The Briscoe Brothers in Liverpool, England.