Given the name, the team is based in Urayasu City, Chiba Prefecture in the Kantō region.

The team has undergone several re-brands throughout is 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,[1] to the Urayasu D-Rocks in 2022 onwards.

They won promotion to the expanded Top League of 14 teams at the end of the 2009–10 season.

[2] The new company, NTT Sports X, was established at the end of the 2022 season and is alleged to have begun with JP¥2.5 billion (US$17.8 million) in capital.

[4] The Urayasu D-Rocks is for the 2024-25 season:[5] Props Hookers Locks Flankers No8s Scrum-halves Fly-halves Centres Wingers Fullbacks Utility Backs