At the 1958 Summer Kōshien, Shuri High (Okinawa) became the first school to represent Okinawa (then under U.S. government rule) in a Kōshien tournament. They were eliminated in their first game by Tsuruga High (Fukui). After the game, they collected souvenirs of dirt and took them home. However, due to health regulations of the Ryūkyū government they were not allowed to keep the dirt, and it was confiscated. Some Japan Airlines flight attendants heard about this, and had a sea stone lying outside Kōshien Stadium sent to Shuri. Even today this "Monument of Friendship" lies in the yard of the school as a reminder of the first trip to Kōshien by a team from Okinawa.
