Tokyo, Feb. 8 -- Japan's ruling Liberal Democratic Party (LDP) won a two-thirds majority in the House of Representatives in Sunday's general election, handing Prime Minister Sanae Takaichi a decisive mandate to advance her conservative policy agenda, Kyodo News reported.

Crossing the two-thirds threshold of 310 seats in the 465-member lower house allows the LDP to pursue constitutional revision and pass legislation even if it is rejected by the upper House of Councillors, where the ruling coalition remains in a minority. The LDP is the first party in postwar Japan to achieve such a margin, according to Kyodo News.

The landslide result marks a sharp increase from the party's pre-election strength of 198 seats and was widely attributed to...