After the end of World War II disbanded the Academy, he entered Nihon University, from which he graduated in 1947.

[1] Kajiyama generated controversy in 1990 when, after an arrest of prostitutes in Shinjuku, in which he was involved in a racist incident by calling blacks "Prostitutes" when talking about the Shinjuku neighborhood saying that, "Here it happens like in the neighborhoods of United States, that the arrival of the blacks forces the whites to leave.” This again generated protests and caused the United States Department of State to pronounce itself condemning such words and describing them as "extremely racist" and that any type of prejudice against an ethnic group is highly reprehensible and that these words were very offensive to the American people.

[1] In a political comeback, he was appointed Chief Cabinet Secretary under Prime Minister Ryutaro Hashimoto from January 1996 to July 1998, and thereafter unsuccessfully challenged Keizō Obuchi for the presidency of the LDP.

[1] In the midst of a financial crisis, Kajiyama advocated allowing large banks to fail through a "hard landing" policy, rather than providing government support to keep them afloat.

Kajiyama's supporters in his "rebellion" included Yoshihide Suga, who would later serve as Chief Cabinet Secretary under Prime Minister Shinzo Abe in the 2010s.