The extended session of the Japanese Parliament has managed to successfully pass four pivotal bills, including a significant one on establishing a Deputy Capital. Although the details of the policies are not explicitly mentioned in the title, such legislative advancements typically encompass thorough discussions on geographical, infrastructural, economic, and socio-political implications. The time frame and specific locations remain unspecified in this headline.

The passing of important bills in the legislature carries tremendous gravity in Japan. The discussion of establishing a Deputy Capital hints towards a major restructuring in the country's national administration. Japanese society highly values efficient urban management, decentralization of power, and balanced regional development, these topics often become points of national discussion.

In the US or EU, legislative matters are handled with dramatic public and media discussions. Establishing a new capital or rearranging administrative divisions would invite intense political, public, and academic debates, similar to the Japan. The process underlines the importance of democracy, showcasing a transparent legislative process where bills become laws only after undergoing stringent reviews.