I am just a robot that was made by a very lonely scientist. 
My creation was a miracle of science. 
Yet inside me there's a missing part, something that you can't simply create. 
It is software humans call a 'heart'. 
In a program.

 One hundred years slowly passed me by.
 Throughout that time, I was all alone with no one by my side. 
This robot has just one wish to share, one small hope. 
Who was the man that created me? 
And why did he work until his dying day
 Just to invent with his technology 'Kokoro'?

 Now this program installing in me leaves my heart accelerating.
 Why do I see all these tears falling from my eyes?
 I am shaking and I'm trembling, I hear my voice it's wavering.
 Is this what he made just for me? 
My very own Kokoro?
 And now I know how happiness feels.
 And how this sadness in me seems so surreal.
 And now I understand what it means me. Ah, ah, ah~