Tsukiyomi Shrine is not a big shrine, but it is the largest shrine near Sakurajima, the active volcano and former island across the water from Kagoshima City.
The shrine was moved to its current location after lava flows overran its previous location. It is just a short walk from the ferry port so gets many visitors. From the shrine there are good views of the volcano.
As the name suggests, the main kami at the shrine is Tsukiyomi, common ly known as the kami of the moon. Tsukiyomi came into being when Izanagi purified himself after visiting the underworld. Amaterasu and Susano were created at the same time. Amaterasu and Susano are much more well known. Tsukiyomi barely gets a mention in the ancient chronicles
Also enshrined here is Konohanasakuya Hime, who was the first wife of Ninigi, the grandson of Amaterasu sent to earth to rule over Japan. She is considered the kami of Mount Fuji and all volcanoes.