Ikuchi-shima was a small island on the Seto Inland Sea. Located to the south of Mihara, Hiroshima, it is about 30 minutes from Mihara by high-speed boat. There are many islands in the Seto Inland Sea, especially in the area of Ikuchi-shima. To the East is Innoshima, to the north is the Samu Island and Gaogen Island, to the west is Omishima, and to the south is Hakatashima. The narrow strip between Gogan Island and Ikuchi-shima is only two or three hundred metres long. In the mornings and evenings, when the water rises and falls, it makes a crashing sound. Maybe it's because Hirayama Ikuo grew up with looking at such a scene and always thought that the sea was flowing. Although there were no special features worth mentioning, the cultivation of oranges was very popular, because the climate was warm, and the land was abundant. As a trade conjunction between Kyushu and Daiwa, it has been famous since ancient times. Hirayama's hometown was Setoda at Toyota District of Hiroshima, located in the northwest of Shengkou Island. It was near Seto Harbour and was a busy area on the island.