RIZIN 31 live from the Pia Arena MM in Yokohama, Japan. The Main event will be a featherweight title match. The champion, Saito, will put the belt on the line for the first time when facing regional champion Juntaro Ushiku.
| Actor | Role |
|---|---|
| YYutaka SaitoNot listed | Not listed |
| JJuntaro UshikuNot listed | Not listed |
| KKanna AsakuraNot listed | Not listed |
| SSaori OshimaNot listed | Not listed |
 Tsuyoshi KamiyamaTsuyoshi Sudario | Tsuyoshi Sudario |
| LLawdlain Saint IlmeNot listed | Not listed |
 Masanori KaneharaNot listed | Not listed |
| TTakahiro AshidaNot listed | Not listed |
| AAkira OkadaNot listed | Not listed |
| DDaichi AbeNot listed | Not listed |
| DDaisuke NakamuraNot listed | Not listed |
| SSuguru NiiNot listed | Not listed |
| RRikuto ShirakawaNot listed | Not listed |
| TTakuya YamamotoNot listed | Not listed |
| YYoshinari NadakaNot listed | Not listed |
| NNaoki IshikawaNot listed | Not listed |
 Yuki ItoNot listed | Not listed |
| YYusaku NakamuraNot listed | Not listed |
| SSeiichiro ItoNot listed | Not listed |
| KKunta HashimotoNot listed | Not listed |
| RRyuya OkuwakiNot listed | Not listed |
| RRyuto OinumaNot listed | Not listed |