Masashi Yuuki is a student of Seidou High and was the popular fourth batter of Kokubun Senior in junior high. Like his brother, he also attended Akadou Junior High.

(Source - Diamond no Ace Wikia)

Picking up the next year after the end of the fall tournament, Seidou High School baseball team battle it out with new and old faces as they begin their tournament run at Koshien.<br><br>

(Source: Crunchyroll)

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He's part of a music unit called AMADEUS under the name "Jack Westwood".

On September 5, 2022, it was announced that he married the filmmaker and director Misato Kato.  

__Non-anime roles:__
- Dr. Ratio - Honkai: Star Rail (VG)