Mitoku-san Sanbutsu-ji Temple is a temple of the Tendai sect of Buddhism, widely known as a “sacred place of mountain Buddhism” for its history and the beauty of its scenery. The temple is especially famous for its national treasure, Nageire-do, which is set on a precipitous cliff. According to legend, Sanbutsuji Temple was founded by Enno Ozunu in 706 during the early Heian period. Enno Ozunu was the founder of Shugendo (mountain asceticism) and chose Mount Mitoku as the site of his ascetic practice. Sanbutsuji Temple derives its name from the name of the mountain “Mitoku-san,” which is associated with the three virtues of Buddhism: compassion, wisdom, and ascetic practice. The entire temple functions as a place for mountain asceticism, and ascetic practitioners of Shugendo have practiced asceticism here since ancient times. The visit to the Debito Hall, which requires climbing a steep mountain path, is still considered part of the physical and mental training for visitors even today. In the Middle Ages, Sanbutsuji Temple flourished as the center of local faith, but declined temporarily due to wars and changes in the times. Nevertheless, its importance grew again as local residents reaffirmed their faith and cultural values. Today, the Mitoku-san temple complex, including Deutsuido, is designated as a National Important Cultural Property and a Special Natural Monument. Debito is also regarded as an architectural symbol of Japanese aesthetics because of its harmony with nature. Built to jut out over a cliff, the hall is a crystallization of the fusion of architectural techniques and faith in a harsh natural environment. In recent years, strict climbing restrictions have been imposed for the protection of the hall and the safety of visitors. Sanbutsuji is not merely a tourist attraction, but still serves as a training center. Therefore, visitors are expected to be aware that the entire mountain is a sanctuary. One of the main characteristics of Sanbutsuji Temple on Mt. Santoku is that visitors can experience a historical atmosphere of harmony between nature, Buddhism, and human faith in this sacred space.