Kuribayashi was selected by the Hiroshima Toyo Carp with the team's first selection in the 2020 Nippon Professional Baseball draft. He made his NPB debut on March 27, 2021, pitching a scoreless inning with 2 strikeouts against the Chunichi Dragons. After recording a stellar 0.55 ERA in 33 appearances to begin the year, Kuribayashi was named an NPB All-Star for the first time in his career.[3] In 2021, Kuribayashi recorded 37 saves with a 0.86 ERA in 53 games and claimed the Central League's Rookie of the Year Award.
In 2022, Kuribayashi pitched as a closer throughout the season and recorded 31 saves with a 1.49 ERA in 48 games.
On June 6, 2023, Kuribayashi pitched a scoreless seventh inning against the Hokkaido Nippon-Ham Fighters, earning his first win in NPB.[4]