"Infinity" 是由 kokia（吉田亞紀子）演唱的一首歌曲。下面是這首歌的歌詞：
[副歌]
Just wanna stay, stay forever
So many nights, I watched you cry
For something that can let you sleep
Now you're in my world, I'll protect you
[第一段]
Day by day, the distance between us grows
Will our love, fade away into infinity?
When we met, the fire was burning low
Will our love, warm up your soul?
I promise I will always stay beside you
If you're lost, I'll lead you through
Cause in this life, I want to be there for you
Just stay right here, that's what I ask of you
[副歌]
Just wanna stay, stay forever
So many nights, I watched you cry
For something that can let you sleep
Now you're in my world, I'll protect you
[第二段]
Every moment, I'm holding on to hope
Will our love, fade away into infinity?
When we kissed, the world stood still for a while
Will our love, forever be real?
I promise I will always be by your side
Through the highs and lows, I'll ride with you till the end
Cause in this life, I want to be there for you
Just stay right here, that's what I ask of you
[副歌]
Just wanna stay, forever and ever
Forever and ever...
Just stay right here, that's what I ask of you
(Forever and ever)
So many nights, I watched you cry (Oh)
(Oh) For something that can let you sleep (Oh)
Now you're in my world, I'll protect you (Oh)
(Oh) So many nights... (Oh)
[尾聲]
Just stay right here... Forever and ever...
(Oh) So many nights... (Oh)
Now you're in my world... (Oh)
I'll protect you... Forever and ever... (Oh)