Koki was born in Kumamoto. He played for the youth teams Azzurino Kumamoto, Solesso Kumamoto, and Roasso Kumamoto. He studied at Meiji University.
Career
Koki joined Roasso in 2021. He made his debut for them in a 2–1 win against Kamatamare Sanuki, coming on in the 70th minute for Thales Paula.[1] He scored his first goal for the club against Fujieda MYFC, scoring a goal in the 70th minute from the bench.[2] He finished the season with 12 appearances.
Koki joined Yokohama in 2023. He made his debut for them in a 1–0 loss to Nagoya Grampus on 18 February 2023.[3]