The LDP or the Liberal Democratic Party has ruled for decades and is currently the ruling party although in the 90s they were out of their thrown. The LDP again reigned supreme again after a decade. The LDP had shaped Japan to what it is now, having one of the strongest economy in the world, however, through the running years, a lot of factions have merged the LDP making it enormous and stronger. The downside is that they have different perspectives and goals as well what binds them together is their similar goals and that is to make thier candidates win.
The prospects of political reforms in Japan today can be related to article 9 of the Japanese Constitution which prevents them from joining any military activity. Japan also doesn't have it's own military force. They only have the self defense force which are limited due to article 9 and so they rely on the United States to protect them even from their neighboring country such as North Korea. Politicians would want reform because they are growing tiresome of not being able to defend themselves against any threat. For them their country is still dependent on other countries when it comes to neutralizing any threat. They want to become a "normal country." And for Japan to become a "Normal Country" they must implement significant economic and political reform.
It is a fight between patriotism and nationalism. Some argue that patriotism is not necessarily nationalism. The Japanese are on the lookout for a normal nation possessing a national anthem and a national flag. However, others would argue that nationalism runs profound among the Japanese and their pacifism is due more to their humiliating defeat during the second World War. As a nation, Japan's deeds have not conformed to its words regarding pacifism which many view more as a catalyst of foreign policy than genuine moral principle. Japan whether they're going to see a revival of militarism is insignificant because Japan needs only to become a "normal" nation pursuig a rational foreign policy, for it to become engaged to war. As a normal nation, Japan's capability to prepare for war is great.