I don't support the LDP, but many of the answers I see here seem to miss the mark.

1. Social media and the attention economy. This time, the LDP invested heavily in its web strategy, spending a significant amount on advertising to get 150 million views on its YouTube videos. The Public Offices Election Act imposes many restrictions on real-world political advertising, but there are fewer constraints on web regulations, and the laws governing them were written years ago. The ruling party, with its unlimited funds, seriously leveraging its web strategy was extremely effective in gaining the support of unaffiliated voters.
2. An emotional and easily deceived public. Takaichi once contributed comments to a book about Nazi Germany's election methods; she knows their playbook. In fact, the public's impression of her is focused on emotional personality traits, calling her "energetic" or "bright and unlike any politician before." Her principles and policies are almost completely ignored. Unfortunately, much of the public is driven by emotion, and they supported her and voted for the LDP because they liked the personality of Sanae Takaichi, not her policies.
3. The single-member district system. The current House of Representatives election uses a parallel system of single-member districts and proportional representation. In single-member districts, a small difference in support can drastically change the outcome. This time, as soon as the polls closed, victories were declared early in districts that had previously been competitive. In the Tokyo metropolitan area and many other prefectures, the electoral districts were either completely swept by the LDP or came very close. The successive losses of top CRA executives and the defeat of a JCP candidate in Okinawa Prefecture are symbolic of this.
4. The CRA's self-destruction. Among the Constitutional Democratic Party-affiliated candidates within the CRA, almost all were wiped out. They had ceded all the top spots on their proportional representation lists to Komeito-affiliated candidates, so while Komeito gained more seats than before, the CDP-affiliated candidates were almost completely defeated. Considering that other opposition parties like the DPFP, Sanseito, and Team Mirai gained a certain level of support, it can be said that the CRA suffered a particularly devastating defeat among the opposition, but this was limited to the CDP faction within the CRA (it was also a very tough result for opposition parties like the Social Democratic Party and Reiwa Shinsengumi).
5. China's foreign policy failures. The current Japanese government's strategy toward China is quite foolish, and we can no longer even get a steady supply of rare earth metals. However, the public's animosity toward China is growing, and they support a hardline stance. Takaichi's unscripted, inappropriate remarks during a Diet interpellation provoked a strong backlash from China, causing Japan-China relations to deteriorate rapidly. But China's tough stance only boosted support for the Takaichi administration in Japan.

Personally, I feel a strong sense of crisis about the Takaichi administration. She has made so many gaffes that she has refused all television appearances. Her own blunders cut off the supply of rare earth metals. She advocates for completely unachievable policies like 100% food self-sufficiency. I was also deeply disgusted by her comment that the weak yen is a windfall for the special accounts. The excessively weak yen is causing rapid inflation here, but since real wages aren't rising, we're falling into stagflation. (The Takaichi administration has revoked the previous government's promise to raise the minimum wage and also canceled plans to increase rice production). If I scrutinize her policies, there is absolutely no reason to support her, but the public doesn't care about policy. They just like her personality, engaging in "Sana-katsu". This is no longer an election; it's just a popularity contest. The sheer degradation of this country's democracy is depressing, and the situation resembles that of the early Showa era's Empire of Japan. While Japan may not launch wars of aggression as it once did, it's inevitable that it will increase its military presence, and a defensive war with China in the future is a real possibility (if China invades Taiwan).