Tetsuo Saito was born in Shimane Prefecture on February 5, 1952. He joined Shimizu Corporation, a major general contractor, in 1976 after completing his graduate studies at Tokyo Institute of Technology. He completed a doctorate in engineering in 1985. Saito served as a researcher at the Princeton Plasma Physics Laboratory in the U.S. between 1986 to 1989. He first won a seat in Hiroshima 1st district of the House of Representatives in 1993. Until winning a seat in Hiroshima 3rd district in 2021, he defended his seat in the proportional representation bloc since 1995. He has also held executive positions in the party, such as the Policy Research Council chair and Komeito secretary general. Saito was appointed Minister of Environment in 2008, and served as the Minister of Land, Infrastructure, Transport and Tourism since 2021.

Makoto Nishida was born in Saitama prefecture on August 27, 1962. He enrolled in Keio University in 1986 and in his second year of college he studied abroad to learn Chinese at a university in Beijing. After graduating from Keio University with an economics degree, he joined Toyo Keizai Inc., a publisher of business periodicals, as a writer. He finished his journalistic career as the deputy editor of the "Weekly Toyo Keizai," one of the most popular business magazines in the country.In 2004, he won a seat as a member of Komeito in the House of Councillors in Saitama Prefectural District. Prior to his appointment as Secretary General in September 2024, he chaired the party's Electoral Policy Committee from 2020 as well as the Board of Directors for the House of Councilors in 2019.