On October 26, 2017, Kuwahara was drafted first round pick by the Yomiuri Giants in the 2017 Nippon Professional Baseball draft.[2]
On May 31, 2018, Kuwahara pitched his debut game in the interleague play against the Hokkaido Nippon-Ham Fighters.[3] On June 14, in the interleague play against the Fukuoka SoftBank Hawks, he became the winning pitcher for the first time.[4] He pitched 5 games in his rookie year.
Kuwahara pitched only 14 games in three seasons. on July 4, 2020, he became the winning pitcher for the first time in two years in a game against the Chunichi Dragons, but on August 12, he fractured his right elbow and underwent surgery.[5][6]
On December 8, 2020, the Giants re-signed him as a developmental player with an estimated salary of 13.2 million yen.[7]
On August 30, 2021, the Giants re-signed Kuwahara as a registered player under control.[8] However, he did not have a chance to pitch in the first league, and on December 9, he was re-signed as a developmental player for 10.6 million yen.[9]
On March 11, 2022, Kuwahara re-signed as a registered player under control.[10] In 2022 season, Kuwahara pitched in a career-high 49 games as a setup man, finished the regular season with a 3-2 win–loss record, 13 holds, and a 5.16 ERA.
In 2023 season, Kuwahara only had a chance to pitched five games in the first league, and the Giants released him on October 28.[11]
On November 28, 2023, Kuwahara signed as a developmental player with the Fukuoka SoftBank Hawks.[1]
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