以下是Key of Heart Boa的歌詞：
We live our lives
On a train of thought
On a track without any doubt
Going towards our future
Living for tomorrow
Dreaming for today
No matter how many nights pass
No matter how many days grow cold
My heart’s singing this song
Through every pain and sorrow
To you
My heart, your key
I will keep you safe and sound
You and I will go through everything
Together we’ll never be alone
Just you and me
Just the two of us
As we live our lives
Through this beautiful world
Your heart is my home
In this endless journey
Through every storm and rain
Through every high and low
You’re my guiding light
Through every pain and sorrow
To you
My heart, your key
I will keep you safe and sound
You and I will go through everything
Together we’ll never be alone
Just you and me
Through every endless night
You’ll always be my guiding light
In this world, I know that we’ll always be together
Just you and me
Just the two of us
Just you and me
Just the two of us.