| Koshiro Sumi 角 昂志郎 | |
| Fullname: | Koshiro Sumi[1] |
| Birth Date: | 13 August 2002 |
| Birth Place: | Tokyo, Japan |
| Height: | 1.65 m |
| Position: | Midfielder |
| Currentclub: | Júbilo Iwata |
| Clubnumber: | 39 |
| Youthyears1: | –2017 |
| Youthclubs1: | Tokyo Musashino City |
| Youthyears2: | 2018–2020 |
| Youthclubs2: | FC Tokyo |
| Collegeyears1: | 2021– |
| College1: | University of Tsukuba |
| Years1: | 2019 |
| Clubs1: | FC Tokyo U-23 |
| Caps1: | 7 |
| Goals1: | 0 |
| Years2: | 2024– |
| Clubs2: | Júbilo Iwata |
| Caps2: | 1 |
| Goals2: | 0 |
| Nationalyears1: | 2017 |
| Nationalteam1: | Japan U15 |
| Nationalcaps1: | 12 |
| Nationalgoals1: | 4 |
| Nationalyears2: | 2017–2018 |
| Nationalteam2: | Japan U16 |
| Nationalcaps2: | 18 |
| Nationalgoals2: | 0 |
| Nationalyears3: | 2019 |
| Nationalteam3: | Japan U17 |
| Nationalcaps3: | 4 |
| Nationalgoals3: | 0 |
| Club-Update: | 17:04, 13 November 2020 (UTC) |
is a Japanese footballer who plays as a midfielder for University of Tsukuba football team. He is also registered to play with Júbilo Iwata under the specially-designated player program.[2]
Japan U16