Junki spent his time studying at the Singapore Sports School before joiningAlbirex Niigata (S)U-17 team in 2020. He was then promoted to the seniorsquad in 2021. On 10 December 2022, Junki signed a contract extension for the 2023season where he would then go on to have his breakout season being used as a starter throughout the entire league matches. On 11 December 2023, he renewed his contract with the club for another year until the end of 2024.