Hirai Ken - Orthodox

"Orthodox"
2021.05.12
Anata ni Naritakatta [Album]

Hirai Ken - Oyasumi Nasai

"Oyasumi Nasai"
2021.05.12
Anata ni Naritakatta [Album]

Hirai Ken - Oni ni Narimashita

"Oni ni Narimashita"
2021.05.12
Anata ni Naritakatta [Album]

Hirai Ken - Polyester no Onna

"Polyester no Onna"
2021.05.12
Anata ni Naritakatta [Album]

Hirai Ken - 1995

"1995"
2021.05.12
Anata ni Naritakatta [Album]
Nippon TV Sukkiri May 2021 theme song

Hirai Ken - Kaibutsu-san feat. Aimyon

"Kaibutsu-san feat. Aimyon"
2020.03.27
"Kaibutsu-san feat. Aimyon" [Single] / Anata ni Naritakatta [Album]

Hirai Ken - #302

"#302"
2019.12.04
"#302" [Single] / Anata ni Naritakatta [Album]
TBS drama Yonpunkan no Marigold theme song

Hirai Ken - Itemo Tattemo

"Itemo Tattemo"
2019.05.29
"Itemo Tattemo" [Single] / Anata ni Naritakatta [Album]
Movie Machida-kun no Sekai theme song

Hirai Ken - Todokanai Kara

"Todokanai Kara"
2018.05.30
"Todokanai Kara" [Single] / Anata ni Naritakatta [Album]
Movie 50kaime no First Kiss theme song

Hirai Ken - Shiranai'n Desho?

"Shiranai'n Desho?"
2018.05.30
"Shiranai'n Desho?" [Single] / Anata ni Naritakatta [Album]
TV Asahi drama Mikaiketsu no Onna: Keishichou Bunsho Sousakan theme song

Hirai Ken - Nonfiction

"Nonfiction"
2017.06.07
"Nonfiction" [Single] / Anata ni Naritakatta [Album]
TBS drama "Chiisa na Kyojin" theme song

Hirai Ken - Boku no Kokoro wo Tsukutte yo

"Boku no Kokoro wo Tsukutte yo"
2017.03.01
"Boku no Kokoro wo Tsukutte yo" [Single] / Anata ni Naritakatta [Album]
Anime movie Doraemon the Movie 2017: Great Adventure in the Antarctic Kachi Kochi theme song

Hirai Ken - Kimi wa Su·te·ki♥

"Kimi wa Su·te·ki♥"
2008.02.20
"Canvas / Kimi wa Su·te·ki♥" [Single] / FAKIN' POP [Album]

Hirai Ken - Bye My Melody

"Bye My Melody"
2006.06.14
"Bye My Melody" [Single] / FAKIN' POP [Album]
"au LISMO" CM song

Hirai Ken - Mabataki

"Mabataki"
2004.11.24
"LIFE is... ~another story~" [Single] / Ken Hirai 15th Anniversary c/w Collection '95-'10 "Ura Uta Baka" [Album]

Hirai Ken - ex-girlfriend

"ex-girlfriend"
2002.05.22
"Strawberry Sex" [Single] / LIFE is... [Album]

Hirai Ken