On March 29, 2019, kaino pitched his debut game against the Saitama Seibu Lions as a relief pitcher, and won the game for the first time in the Pacific League.[2] In 2019, the rookie year, he finished the regular season with a 2–5 Win–loss record, a 4.14 ERA, 73 strikeouts in 58+2⁄3 innings, 26 Holds, and 8 saves. And he pitched as a Setup man against the Yomiuri Giants in the 2019 Japan Series.
In 2020, Kaino hurt his right elbow in spring training and spent the season rehabilitating his right elbow.[3]
And he had surgery on his right elbow on December 4.[4]
In 2021 season, Kaino spent the first half of the season in rehabilitation, but on August 15, against the Hokkaido Nippon-Ham Fighters, he pitched for the first time in 662 days in the Pacific League.[5] He recorded with a 22 Games pitched, a 0–2 Win–loss record, a 4.35 ERA, a 4 Holds, a one saves. and a 25 strikeouts in 20.2 innings.
In 2022 season, he finished the regular season with a 27 Games pitched, a 2–0 Win–loss record, a 2.52 ERA, a 3 Holds, and a 27 strikeouts in 25 innings.
On July 1, 2023, Kaino pitched as a closer against the Saitama Seibu Lions and recorded a save for the first time in two years.[6] In 2023 season, he finished the regular season with a 46 Games pitched, a 3-1 Win–loss record, a 2.53 ERA, a 8 holds, a 2 saves, and a 39 strikeouts in 42.2 innings.
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