Morihara began his career with the Tohoku Rakuten Golden Eagles, making his NPB debut on March 31, 2017. In his rookie campaign, he pitched to a 2-4 record and 4.81 ERA across 42 appearances. His numbers took a dip in 2018, regressing to a 5.82 ERA with 19 strikeouts across 17.0 innings pitched. Morihara made 64 appearances for the Eagles in 2019, posting the best season of his career. In 64.0 innings of work, he struck out 65 batters, while working to a 4-2 record and 1.97 ERA.[1]
In the COVID-19-affected 2020 season, Morihara took a big step back, struggling to a 7.56 ERA with 14 strikeouts across 17 contests. He returned the next year to make 34 appearances, posting a tidy 2.78 ERA with 30 strikeouts in 32.1 innings pitched. In 2022, Morihara pitched in 3 games for the Eagles, allowing no runs in any of the games.
Yokohama DeNA BayStars
On July 26, 2022, Morihara was traded to the Yokohama DeNA BayStars in exchange for Yukiya Itoh.[2] He made 6 appearances for Yokohama to close out the season, allowing 4 earned runs while striking out 8 in 6.0 innings pitched.
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