The Oki Classical Sumo Tournament is a unique traditional event that has been passed down through generations in the Oki Islands of Shimane Prefecture. Unlike ordinary sumo tournaments, it is not held every year. Instead, it is traditionally organized only when the island community has an important occasion to celebrate, such as the rebuilding of a shrine, the completion of a new school, or the opening of a public facility.
The event is held as a communal celebration and an expression of gratitude to the gods. It begins in the evening and continues through the night until around midday the following day, lasting approximately 20 hours. Because of its all-night format, it has traditionally been known as “overnight sumo” or “shrine sumo.” Today, it is widely known as Oki Classical Sumo and remains one of the islands’ most distinctive cultural traditions.
Approximately 200 wrestlers take part in the tournament, while nearly 300 bouts may be held throughout the event. With a total population of around 14,000 people across the islands, the tournament can attract approximately 2,000 to 3,000 spectators.
The venue remains lively late into the night, with enthusiastic cheering from spectators. The scale of participation reflects the important role this event has played in the community and the strong connections among the people of the Oki Islands.
One of the most distinctive features of Oki Classical Sumo is a tradition known as “ningen-jō no sumo,” or “human-hearted sumo.” Instead of focusing solely on victory and defeat, wrestlers generally compete against the same opponent twice.
If one wrestler wins the first bout, that wrestler is expected to allow the opponent to win the second bout, resulting in one victory each. This custom reflects the importance of maintaining harmony within a small island community, where people live and work closely together.
The tradition demonstrates that the purpose of the tournament goes beyond determining a winner. Mutual respect, friendship, and community harmony are central to the spirit of Oki Classical Sumo.
Oki Classical Sumo is also known as “pillar sumo” because special prizes awarded to the highest-ranking wrestlers are enormous wooden pillars. Each pillar is approximately 5 meters long and weighs more than 300 kilograms.
At the end of the tournament, the winning wrestlers receive these massive pillars. Members of the local community then lift and carry the wrestlers together with the pillars around the sumo ring while shouting celebratory calls. This spectacular scene has become one of the defining images of the Oki Classical Sumo tradition.
The event begins with a ring purification ceremony known as a dohyo festival. This sacred ritual is held to pray for the safety of the tournament. Depending on the occasion, Shinto priests may conduct prayers and traditional kagura performances.
Afterward, all participating wrestlers are introduced in a formal ring-entering ceremony. As the wrestlers appear one after another, anticipation builds among the spectators and the atmosphere becomes increasingly energetic.
After nightfall, the competition begins with “Kusamusubi,” featuring young wrestlers generally between 15 and around 20 years old. Their determined bouts are met with enthusiastic support from family members, friends, and spectators.
The program then continues with competitions involving junior high school students, high school students, and adult wrestlers. Events such as “wari-zumo” and “five-man knockout bouts” add variety and excitement to the long night of competition.
In the five-man event, a wrestler must continue fighting until defeating five consecutive opponents. The challenge keeps the crowd engaged even in the middle of the night, creating an atmosphere that is quite different from an ordinary sporting event.
After a night of competition, the tournament reaches its main stage in the morning. Stronger wrestlers compete in the “five official bouts”, followed by matches involving the highest-ranking wrestlers, including the komusubi, sekiwake, and ozeki ranks.
The final ozeki match is particularly dramatic. Spectators join in by throwing large amounts of salt into the ring, filling the venue with excitement. At times, so much salt is thrown that the entire sumo ring becomes almost completely white. This striking spectacle is one of the most memorable moments of Oki Classical Sumo.
Sumo has a very long history on the Oki Islands, and local traditions trace its origins back as far as the Nara period. During the Edo period, kanjin-zumo, or fundraising sumo, became an important part of local life. Matches were held to raise money for the repair and maintenance of important shrines, including Mizuwakasu Shrine.
Because these matches were often held at shrines and offered to the deities, the tradition also became known as shrine sumo. Over time, it developed into a religious and community celebration associated with gratitude for good harvests and prayers for the prosperity of the local area.
The tradition faced a difficult period during Japan’s rapid economic growth, when many young people left the islands for employment and education elsewhere. As the local population changed, the sumo tradition declined and the tournament was temporarily discontinued.
Local residents worked to preserve this important part of their cultural heritage, and the event was revived in 1972 under its present name, Oki Classical Sumo Tournament.
Since then, it has continued as one of the Oki Islands’ distinctive cultural events, carrying the history, values, and community spirit of the islands into the present day.
The appeal of Oki Classical Sumo lies not simply in the wrestling itself, but in the way the event brings together community ties, religious traditions, hospitality, and mutual support. Wrestlers are only one part of the celebration. Local residents who prepare food, families and friends who cheer from the audience, and the many people who help organize the event all contribute to its success.
After the sumo ends, the celebration traditionally continues with a communal feast known as a naorai. People gather together to share food and celebrate the occasion, reinforcing the sense of connection that lies at the heart of the tradition.
The Oki Classical Sumo Tournament is not held every year. For travelers who happen to visit the Oki Islands when a tournament is scheduled, attending can provide a rare opportunity to experience a living tradition that is deeply connected with island history and community life.
The combination of overnight matches, passionate local support, sacred ceremonies, traditional customs, and communal celebration creates an experience unlike a conventional sumo tournament. For visitors exploring the Oki Islands, the event offers a chance to discover not only the islands’ spectacular natural scenery, but also the history, beliefs, and community spirit that have shaped life here for generations.