Ken Hirai
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.
Wenny Has Wings
(Theme Song Performance)
A Stitch of Life
(Theme Song Performance)
Doraemon: Nobita's Great Adventure in the Antarctic Kachi Kochi
(Theme Song Performance)
Star Watching Dog
(Theme Song Performance)
The World of Machida-kun
(Theme Song Performance)
50 First Kisses
(Theme Song Performance)
50 First Kisses
(Songs)
未解決の女 警視庁文書捜査官～緋色のシグナル～
(Theme Song Performance)
Tengoku e no Ouenka Cheers
(Songs)
Marigold in 4 Minutes
(Theme Song Performance)
Psycho Doctor
(Theme Song Performance)
Love Revolution
(Theme Song Performance)
王様のレストラン
(Theme Song Performance)
The Tragedy of W
(Theme Song Performance)
Women Document Detectives
(Theme Song Performance)
The Three Musketeers
(Theme Song Performance)
Good Partner
(Theme Song Performance)
Like Shooting Stars in the Twilight
(Theme Song Performance)
Napoleon's Village
(Theme Song Performance)
Little Giants
(Theme Song Performance)