《BoA Only One Japanese》的歌詞如下：
(Japanese)
Every day, every way, every thought of you
I'm only one, only one, only one for you
(English)
Only one, I'm only one for you
(Japanese)
Every night, every dream, every memory of you
I'm only one, only one, only one for you
(English)
Only one, I'm only one
(Japanese)
君の夢を見る度 愛が増すよ
ただ一つ願い 君の幸せを
(English)
Every time I dream of you, love grows stronger
I only have one wish, that you are happy
(Japanese)
そして時に寂しさ抱えながらも
ただ一つの想い 君の傍にいるだけで
(English)
And sometimes I feel lonely, but I'm here by your side
Just wanting to be near you is all I need
(Japanese)
Only one, I'm only one for you
Every day, every way, every thought of you
Only one, I'm only one for you
Every night, every dream, every memory of you
(English)
Only one, I'm only one for you
Every day and night, every thought of you
Only one, I'm only one for you
Every dream and memory, just for you
(Japanese)
もう二度と 離さない 君の傍にいたい
ただ一つ願う あの夢を葉えるために...。
(English)
I won't let go again, I want to be by your side
For the dream we once had, I will work towards making it true.
總的來說，這首歌曲表達了對一個人的深深愛意和想要一直陪伴在對方身邊的願望。