| 9. Round | 04/07/2021 | Yokohama F. Marinos [U18] | - | Ryutsu Keizai University [U18] | 3:2 | ||||
| 14. Round | 10/10/2021 | Ichiritsu Funabashi High School [U18] | - | Yokohama F. Marinos [U18] | 0:1 |  |
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| 15. Round | 17/10/2021 | Yokohama FC [U18] | - | Yokohama F. Marinos [U18] | 1:3 | ||||
| 8. Round | 23/10/2021 | Omiya Ardija [U18] | - | Yokohama F. Marinos [U18] | 6:1 | |
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| 11. Round | 06/11/2021 | Yokohama F. Marinos [U18] | - | Kashiwa Reysol [U18] | 3:2 | ||||
| 10. Round | 14/11/2021 | Shimizu S-Pulse [U18] | - | Yokohama F. Marinos [U18] | 4:0 | ||||
| 12. Round | 17/11/2021 | Yokohama F. Marinos [U18] | - | FC Tokyo [U18] | 4:1 | ||||
| 16. Round | 21/11/2021 | Yokohama F. Marinos [U18] | - | Urawa Red Diamonds [U18] | 6:2 | ||||
| 18. Round | 05/12/2021 | Ryutsu Keizai University [U18] | - | Yokohama F. Marinos [U18] | 2:0 |
Japan