[4] After graduating, he became an official in the Ministry of Home Affairs, eventually becoming vice minister and Liberal Democratic Party policy chief.

[4] Kumashiro served four terms in the Diet of Japan as a Liberal Democratic Party member of the House of Representatives, holding the District 2 seat of Okayama Prefecture.

[6] Though he initially thought of non-profit organizations as anti-government, he came to believe that they were a force of good in Japan, and advocated for less government intervention in their affairs.

[8] He headed the LDP's financial reconstruction committee in 2002, which sought to fix downturns in the Japanese economy.

[2] When he failed to support postal privatization due to his belief in Trinity, Prime Minister of Japan Junichiro Koizumi labeled him a "rebel" member of the party, and fielded Seiji Hagiwara as the "official" party candidate, causing Kumashiro to drop out of the race.

[10] After dropping out, he ran for Mayor of Okayama, an office that Hagiwara had vacated to run for the Diet, but lost the race.