On October 26, 2017, Shiino was drafted by the Fukuoka Softbank Hawks in the 2017 Nippon Professional Baseball draft.[1]
On May 27, 2018, Shiino pitched his debut game against the Tohoku Rakuten Golden Eagles as a relief pitcher.
[2] His regular season pitch was only that one game, but he pitched against the Saitama Seibu Lions in the 2018 Pacific League Climax Series in the Postseason.[3] And he was selected as the Japan Series roster in the 2018 Japan Series.[4]
On June 5, 2019, Shiino won the game as a relief pitcher for the first time.[5] In 2019 season, he finished the regular season with a 36 Games pitched, a 5–2 Win–loss record, a 3.13 ERA, a 6 Holds, a 49 strikeouts in 46 innings. And he was selected as the Japan Series roster in the 2019 Japan Series.[6]
In 2020 season, Shiino finished the regular season with a 12 Games pitched, a 1–1 Win–loss record, a 5.73 ERA, a one Hold, a 13 strikeouts in 11 innings. In the 2020 Japan Series against the Yomiuri Giants, He pitched for the first time in the Japan Series in Game 2 and contributed to the team's fourth consecutive Japan Series championship with no runs in bottom of 9th inning.[7]
In 2021 seasons, He never had a chance to pitch in the Pacific League.[8]
On June 7, 2022, Shiino pitched in the First League for the first time in two seasons.[9] In 2022 seasons, he finished the regular season with 18 Games pitched, a 0–0 Win–loss record, a 4.01 ERA, a one holds and a 14 strikeouts in 34 innings.
In 2023 season, Shiino recorded with a 11 Games pitched, a 0–1 Win–loss record, a 3.86 ERA, and a 17 strikeouts in 16.1 innings. On October 22, the Hawks announced release him.[10]
On November 30, 2023, Shiino announced that he would retire as an active player. He is also scheduled to be on the team's staff starting next season.[11]
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