Yamaguchi was a former writer for Gong Magazine,[3] and attained his greatest fame in the World Wrestling Federation (WWF), as the manager of Kai En Tai in 1998.

He recruited Sho Funaki, Mens Teioh, and Dick Togo to form the stable Kai En Tai, who feuded with Taka Michinoku.

Venis was dragged backstage to seemingly have his penis amputated, which led to the infamous "castration" scene on the 3 August episode of Raw Is War.

[7] Venis later explained that Yamaguchi's sword narrowly missed his penis, owing to a "little shrinkage" and some timely assistance from "friend" John Wayne Bobbitt.

[8] Yamaguchi, Togo and Teioh were later granted their release and returned to Japan, while Taka and Funaki stayed and became a regular tag team.