| Season | Team | Competition | MP | G | A | Rating | ||
|---|---|---|---|---|---|---|---|---|
| 2026 | Blaublitz | J2/J3 League | 12 | 0 | 1 | 0 | 0 | – |
| 2025 | Blaublitz | J2 League | 27 | 1 | 1 | 3 | 1 | – |
| 2024 | Mito | J2 League | 27 | 3 | 1 | 3 | 0 | – |
| 2023 | Mito | J2 League | 21 | 1 | 0 | 4 | 0 | – |
| 2022 | Kyoto | J1 League | 9 | 0 | 0 | 0 | 0 | 6.5 |
| 2021 | Kyoto | J2 League | 12 | 0 | 0 | 0 | 0 | – |
| 2020 | Kyoto | J2 League | 3 | 0 | 0 | 0 | 0 | – |
| Total | 111 | 5 | 3 | 10 | 1 | – | ||
| Fecha | Desde | Hacia | Tipo | |
|---|---|---|---|---|
| 02 ene 2026 | Mito | Blaublitz | ||
| - | Blaublitz | Mito | Return from loan | |
| 02 ene 2025 | Mito | Blaublitz | Loan | |
| 01 sept 2023 | Kyoto | Mito | Transfer | |
| 02 ene 2021 | Kyoto | Kyoto | Free agent | |
| - | Kansai | Kyoto |
K. Nagai career history shows progression across clubs and competitions, including club timeline, national team appearances and overall career totals.