NTT DoCoMo Red Hurricanes won the competition for the third time – having previously won in 2010–11 and 2016–17 and qualified for the promotion play-offs, along with Mitsubishi Sagamihara DynaBoars, Kintetsu Liners and Kurita Water Gush.
Kamaishi Seawaves and Chugoku Red Regulions finished seventh and eighth respectively to qualify for the relegation play-offs.
In January 2017, the JRFU announced the format of the Top Challenge League competition.
The two team that finished bottom and second-bottom of Group B progressed to the relegation play-offs, along with the winners and the runners-up of the Regional Challenge, held between the champions of the Top East League, Top West League and Top Kyūshū League.
The standings for the 2018 Top Challenge League Second Stage Group A are: