日本今天举行首相指名选举：选举产生接替石破茂的日本第104任首相

Core Points - Japan is set to hold a temporary National Assembly on the 21st to elect the 104th Prime Minister, succeeding Shigeru Ishiba [1] - The ruling Liberal Democratic Party (LDP) and the Japan Innovation Party have reached an agreement to form a coalition government, focusing on economic measures, constitutional amendments, and structural reforms [1] - The LDP currently holds 196 out of 465 seats in the House of Representatives, while the Japan Innovation Party holds 35 seats [2] Group 1 - The election process involves a first round where a candidate must secure a majority to win; if no candidate achieves this, the top two candidates will proceed to a second round [1] - The coalition agreement includes a proposal to reduce the number of seats in the House of Representatives by approximately 10% [1] - The Japan Innovation Party has confirmed its support for LDP candidate Sanae Takaichi in the Prime Minister election [1] Group 2 - The LDP and Japan Innovation Party together do not hold a majority in both houses, which may lead to challenges in governance for Takaichi if elected [2] - The Constitutional Democratic Party has announced its support for its leader, Yoshihiko Noda, in the election, indicating a shift in strategy due to the LDP's coalition [2] - Historical trends suggest that new governments facing early political turmoil may have shorter tenures, potentially collapsing within one to two years [2]