| Roles | Competed in Youth Olympic Games |
|---|---|
| Sex | Male |
| Full name | Kosei•Hayashi |
| Used name | Kosei•Hayashi |
| Original name | 林•康生 |
| Born | 23 October 2003 in Kizugawa, Kyoto (JPN) |
| Affiliations | Chikyu Kankyo High School |
| NOC |  Japan |
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 2020 Winter Youth Olympics | Short Track Speed Skating (Skating) | JPN |
Kosei Hayashi | |||
| 500 metres, Boys (YOG) | 14 | |||||
| 3,000 metres Relay, Mixed Youth (YOG) | Team C | 6 | ||||
| 1,000 metres, Boys (YOG) | 8 |
