International Exposition in 1867, Satsuma-Ryukyu actually refers to Satsuma domain. Satsuma domain intended to participate as a government of equal status with the Japanese shogunate government, citing the independence of the Ryukyu Kingdom in the East Asian world. But the government of Satsuma-Ryukyu was not real. Satsuma domain, who wanted to push for Japan's "increasing wealth and military power" and interact with Western civilization, was one of the diplomatic strategies using the Ryukyu Kingdom to avoid political interference from Japanese shogunate government. The delegation sent by Satsuma domain impersonated the royal delegation of the Ryukyu Kingdom, and in fact, the royal delegation did not participate. Nevertheless, Satsuma domain's participation in the Paris International Exhibition under the name Satsuma-Ryukyu does not mean that he freely controlled the Kingdom of Ryukyu. As can be seen in the Concealment Policy and the 'Makishi-Onga Incident', It can be seen that Ryukyu has been trying to exist as an independent kingdom in the East Asian world, balancing politics with a certain distance from Satsuma domain. However, by using the title "Satsuma-Ryukyu," it remains unchanged that Ryukyu exists internationally as an independent kingdom in the East Asian world. Although the political ties between Satsuma domain and the Kingdom of Ryukyu were ostensibly revealed, Although the political ties between Satsuma domain and the Kingdom of Ryukyu were ostensibly revealed, Satsuma domain is essentially meaningful in that he is clearly drawing a line between Ryukyu and Japan, formalizing that the Kingdom of Ryukyu is not in a political mainstream relationship with the Japanese government. It was also an opportunity to inform the Western world that Ryukyu was politically independent from Japan by Satsuma domain.

In 2018, UNESCO recommended that Japan's “Raiho-shin(visiting gods), rituals of deities in masks and costumes” be registered as human intangible cultural heritage. From Namahage in Akita Prefecture to Toshidon in Miyakojima and Pantu in and Kagoshima, the most representative events of visiting gods are organized throughout Japan. In the Raiho-shin event, a strange-looking god goes around each house, blesses people, and warns lazy people. Such rituals solidify the unity of the region and pass on generations and it strongly embraces the identity of the region. Furthermore, after the UNESCO Intangible Cultural Heritage Registration Recommendation, it may be functioning as tourism content that represents the region. Although they were taken to different places at different times in each region, the number of tourists is increasing every year in order to view and participate in Raiho-shin rituals, which has a great impact on the tourism industry in that region. There was not much participation of outsiders due to the influence of covid 19 this year, but rather, in these disaster situations, discussions focused on the use of these rituals as a measure to strengthen the cohesiveness of the local community.

This study examines the seas of Kyushu by distinguishing the north and south waters of Kyushu. First, it talks about the Goto Islands and Japanese missions to Tang China, especially with focus on the Fukue Island (福江島), which is the biggest of the Goto Islands and is located in the southeastern most part. Moreover, this study examines the Nansei Islands stretched out in a long arc in the southeast of Kyushu and the East China Sea (東支那海) surrounding these islands. It also explores the significance of interchange with the East Asian world including ancient Japan through the sea routes of the Goto Islands and Nansei Islands that are the north and south of Kyushu. As a result, we can analyze the East Asian world that had not been receiving much attention in the past from the outside in a new perspective. Furthermore, this study on the sea routes of the Goto Islands and Nansei Islands can extend the research accomplishments that had been focused on land. There was an imbalance in examining the members of the East Asian world with focus on land. In contrast, looking at this world from the sea implies that they could seek mutual exchange in equal positions.