edit: Updated with the official lyrics.
You are the only one
See? The future yelled
that the present isn’t the answer
We’ve messed up
and gone astray
more often than not
Even so, I really can’t keep
my eyes off of you
I want to watch over you, beside you, forever
I love you so much that it’s impossible
to love you more than this
Up to now and hereafter
Forever the only one
The things you believe in vanish,
your hopes betray you
And it feels like
the world is ending
Days like those definitely do happen
Whenever you’re sad
I’ll become the world’s greatest clown
So, let me dream a little longer
You are the only one
You are the only one
You are the only one
You are the only one
You are the only one, only one
You are the only one, only one
Forever the only one
You are the only one
Japanese lyrics: