Since his debut, Hirai has worked as a model, actor, composer, lyricist, singer, and spokesperson.
During his career, Hirai has released 45 singles and nine studio albums as of January 2019. According to Oricon, his single Hitomi o Tojite (Close Your Eyes) became the best-selling single of 2004 in Japan, while his compilation album Ken Hirai 10th Anniversary Complete Single Collection '95–'05 "Utabaka" became the best-selling album of 2006 in Japan.
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