Yusei Koga
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| Yusei Koga 6-dan | |
|---|---|
| Native name | 古賀悠聖 |
| Date of Birth | 1 January 2001 |
| Place of Birth | Fukuoka City, Fukuoka Prefecture |
| Teacher | Isao Nakata 8-dan |
| Ryuo group | Group 6 |
| Junni class | Class B2 |
| Rank | Date |
|---|---|
| 6-kyu | September 2011 |
| 3-dan | October 2017 |
| 4-dan | 1 October 2020 |
| 5-dan | 14 March 2023 |
| 6-dan | 5 March 2024 |