Urayasu D-Rocks, commonly known as the D-Rocks, or the Shining Arcs, is a rugby union team owned by NTT Communications and is part of Japan's Rugby League One competition, currently in Division 1. Given the name, the team is based in Urayasu City, Chiba Prefecture in the Kantà  region. The team has undergone several re-brands throughout its history, most recently in 2022, rebranding from Shining Arcs Tokyo-Bay Urayasu in line with the newly formed Japan Rugby League One competition in 2021/22, to the Urayasu D-Rocks in 2022 onwards.
NTT Communications RFC was founded in 1976. They won promotion to the expanded Top League of 14 teams at the end of the 2009âÂÂ10 season. They made their Top League debut for the 2010âÂÂ11 season. After their first season, they finished 12th place with 4 wins and 9 losses. They had to play a play-off to keep themselves in the Top League, in which they beat Canon Eagles 31âÂÂ19. In the 2011âÂÂ12 season, they finished in ninth place.
In July 2022, following the establishment of a new rugby business and sports company by parent company NTT, the Shining Arcs formally rebranded to the Urayasu D-Rocks. The new company, NTT Sports X, was established at the end of the 2022 season and is alleged to have begun with JPÃÂ¥2.5 billion (US$17.8 million) in capital.
The Urayasu D-Rocks is for the 2025-26 season: