Key Facts
• October 8, 2025: Seitaro Yamaguchi announced as candidate for Kumamoto District 1.
• Yamaguchi, 36, from Saga City, ran in July 2025 Upper House election but lost.
• He secured over 200,000 votes in the Kumamoto constituency but was defeated by the incumbent.
• After his loss, Yamaguchi continued grassroots activities, including street speeches.
• He applied for official endorsement from the Sanseitō party, which was granted.
• Yamaguchi expressed determination to prepare for the election, regardless of timing.
• Sanseitō is also considering candidates for other Kumamoto constituencies.
• The Democratic Party for the People is evaluating a candidate for Kumamoto District 1.
• The current representative for Kumamoto District 1 is Minoru Kihara from the Liberal Democratic Party.
Summary
Seitaro Yamaguchi, a 36-year-old from Saga City, has been officially endorsed by the Sanseitō party to run in Kumamoto District 1 for the upcoming Lower House election. Despite losing the July 2025 Upper House election in the Kumamoto constituency, where he garnered over 200,000 votes, Yamaguchi remained active in grassroots campaigning. His candidacy was confirmed on October 8, 2025, following his application for party endorsement. Yamaguchi expressed his commitment to meeting public expectations and preparing thoroughly for the election. Meanwhile, Sanseitō is exploring additional candidates for other Kumamoto districts, and the Democratic Party for the People is considering a candidate for the same district. The current representative for Kumamoto District 1 is Minoru Kihara of the Liberal Democratic Party.
