Okumura usually teams up with wrestlers from Japan who visit CMLL, currently as a group known as La Ola Amarilla (Spanish for "The Yellow Wave").

On September 8, 2001, Okumura and Nobutaka Araya lost to Arashi and Koki Kitahara, in a match for the vacant All Asia Tag Team Championship.

In Mexico, he began working for Consejo Mundial de Lucha Libre (CMLL) as a Heel (or "bad guy") "Anti-Mexico" character.

The trio worked on CMLL's 72nd Anniversary show, losing to the all-Mexican team of Último Guerrero, Rey Bucanero and Averno.

[9] On June 18, 2006, Okumura once again participated in a multi-man Steel Cage Lucha de Apuesta match, putting his hair on the line against Rey Bucanero, Universo 2000, Negro Casas, Tarzan Boy, Máximo, Heavy Metal, and El Terrible.

On May 11, 2007, Okumura and Goto both participated in that year's International Gran Prix teaming with Alex Koslov, Marco Corleone, Minoru Suzuki, Jushin Thunder Liger, and Último Dragón.

The team was given a strong push, booked to win a series of high-profile matches against various Mexican tecnicos (Faces or "good guys").

[16] On May 7, 2010, Okumura and Taichi teamed up with former IWGP World Heavyweight Champion Hiroshi Tanahashi to defeat El Hijo del Fantasma, La Máscara, and Héctor Garza to win the CMLL World Trios Championship in the main event of the weekly Friday night Super Viernes show.

[20] In March 2012 NJPW trainee Kyosuke Mikami came to Mexico for an extended learning tour, he was given the ring name Namajague and a mask to go with it and teamed up with Okumura.

In September 2012 La Fiebre Amarilla unsuccessfully challenged for the CMLL Arena Coliseo Tag Team Championship as defending champions Fuego and Stuka, Jr. were victorious.

[22] On March 3, 2013, Okumura and Namajague defeated Fuego and Stuka, Jr. to win the CMLL Arena Coliseo Tag Team Championship.

[24] On November 3, Okumura and Namajague lost the Arena Coliseo Tag Team Championship to Delta and Guerrero Maya, Jr.[25] In January 2015, Okumura returned to Japan to take part in the Fantastica Mania 2015 tour, during which he unsuccessfully challenged Ángel de Oro for the CMLL World Light Heavyweight Championship.