RIZIN 38 live from the Saitama Super Arena in Saitama, Japan. The event includes the continuation of their Super Atomweight Grand Prix and Hiromasa Ougikubo’s first appearance since winning a bantamweight tournament last year. In what is the biggest return of the night, RIZIN Bantamweight Champion Kyoji Horiguchi fights in Japan for the first time since late 2020, facing Kintaro in the main event.
| Actor | Role |
|---|---|
 Kyoji HoriguchiNot listed | Not listed |
| YYuto HokamuraKintaro | Kintaro |
| SSeika IzawaNot listed | Not listed |
| AAnastasiya SvetkivskaNot listed | Not listed |
| SSi Woo ParkNot listed | Not listed |
 Ayaka HamasakiNot listed | Not listed |
| SSoo Chul KimNot listed | Not listed |
| HHiromasa OugikuboNot listed | Not listed |
| CCally Gibrainn de OliveiraNot listed | Not listed |
| SShoma ShibisaiNot listed | Not listed |
| CChihiro SuzukiNot listed | Not listed |
| KKyohei HagiwaraNot listed | Not listed |
| JJuri OharaNot listed | Not listed |
| LLuiz GustavoNot listed | Not listed |