This study examines the expansion of Japan's international public relations in the 2010s, focusing on activities led by the Cabinet Office's Public Relations Office. Analysing administrative project reviews, it reveals a significant rise in costs and diversification of methods during this period. The research provides empirical evidence of the quantitative and qualitative growth of these efforts and situates them within a broader strategy to promote understanding of Japan. It emphasises the importance of strategic international communication in enhancing Japan's global influence, a topic often overlooked in domestic studies of government public relations.

There is little research on local government public relations due to surrounding characteristics specific to the public sector, such as its public nature. Therefore, it is necessary to advance research by utilizing knowledge accumulated in other fields, and in this paper, we use the concept and methodology of Agenda-setting study, which has long been discussed in mass communication research, to analyze the relationship between public relations channels and satisfaction with city government. It was revealed that there is a correlation between the content of public relations magazines and satisfaction with city government, with the optimal effect span being six to nine months, and that there is a strong correlation with age groups that have more exposure to media. These relationships suggest a cyclical relationship between public relations activities and public hearing activities, and we proposed the concept of the public relations ecosystem, which represents the relationship between citizen awareness and public relations.

When a corporate scandal occurs, a corporation and journalists face each other in the roles of "defense" and "offense". Are there any differences in viewpoint toward apology speeches between corporations and journalists? To answer this question, I have conducted research in which I had both public relations professionals and journalists write manuscripts of an apology speech under scandal situation and have analyzed them quantitatively. As a result, it was found that the former tend to use as many apologetic expressions as possible to make the company's stance appear lower, while the latter tend to spend their words on practical solutions.

This study examines the current status of internal communication in Japanese companies through a web-monitor survey (n=1082). The results showed that many small- and medium-sized companies have not established a corporate philosophy and have not implemented internal communication. The study also examined whether internal communication can be said to influence employee behavior. Those who reported that their employers had adequate internal communication also scored higher on the Employee Performance Scale in a multivariate analysis that took into account company size, educational background, and other factors.