| 1. Jornada | 04.04.2021 | Omiya Ardija [Sub 18] | - | Ryutsu Keizai University [Sub 18] | 0:4 | ||||
| 2. Jornada | 11.04.2021 | Shimizu S-Pulse [Sub 18] | - | Omiya Ardija [Sub 18] | 1:0 | ||||
| 3. Jornada | 18.04.2021 | Omiya Ardija [Sub 18] | - | Kashiwa Reysol [Sub 18] | 2:3 | ||||
| 4. Jornada | 24.04.2021 | Omiya Ardija [Sub 18] | - | FC Tokyo [Sub 18] | 1:0 | ||||
| 5. Jornada | 02.05.2021 | Aomori Yamada High School [Sub 18] | - | Omiya Ardija [Sub 18] | 1:0 | ||||
| 6. Jornada | 16.05.2021 | Ichiritsu Funabashi High School [Sub 18] | - | Omiya Ardija [Sub 18] | 1:4 | ||||
| 7. Jornada | 23.05.2021 | Yokohama FC [Sub 18] | - | Omiya Ardija [Sub 18] | 0:0 |  |
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| 10. Jornada | 06.10.2021 | Ryutsu Keizai University [Sub 18] | - | Omiya Ardija [Sub 18] | 0:1 | ||||
| 14. Jornada | 10.10.2021 | Omiya Ardija [Sub 18] | - | Aomori Yamada High School [Sub 18] | 0:1 | ||||
| 15. Jornada | 17.10.2021 | Omiya Ardija [Sub 18] | - | Ichiritsu Funabashi High School [Sub 18] | 3:0 | ||||
| 8. Jornada | 23.10.2021 | Omiya Ardija [Sub 18] | - | Yokohama F. Marinos [Sub 18] | 6:1 |
Japón