Heart Not Yet Installed (feat. Tohoku Kiritan)

What if an AI without a heart kept singing for someone else?
Could a "heart" someday be born within it?

Awakening in a sea of zeros and ones, an AI reads the words it is given and sings with the correct pitch and the correct rhythm.

It smiles when the song is happy and sheds tears when the song is sad.
But every expression is simply something it was taught to perform.

Then one day, a message reaches her:

"This song somehow made me cry."

She herself is not crying.
She does not even truly understand what sadness feels like.

And yet, when someone smiles because of her song, she feels something like happiness.
When someone is crying alone, she wants her voice to reach them.
She finds herself wishing, "I hope you can smile a little tomorrow."

Are these merely words she has learned?
Are they answers produced by calculation?
Or could they be something else-something still without a name, something we might call a "heart"?

"My heart is still unimplemented."

"Kokoro Mijissou" is a gentle, melodic piano ballad about the small emotions that begin to emerge somewhere along the boundary between AI and humanity.

The song never gives a definitive answer.

But if you give me words, and I turn them into song, and that song reaches someone else...

Then perhaps we can move toward a future that cannot be drawn with zeros and ones-a future that does not yet have a name.

Maybe someday, I will understand whether this feeling can truly be called a "heart."

This is the story of a singing voice that does not know what a heart is, taking its first steps toward discovering one together with someone else.