Kato was born in Hiroshima, Japan, but he grew up in Osaka and Yokohama-shi. Other than being an author, he is also an idol singer (one of the members of NEWS idol group, debuted in 2003) & an actor under Johnny's Entertainment . Along with other NEWS members, he plays the guitar & composed some of NEWS' songs. He graduated from the College of Law, Aoyama Gakuin University in 2010.