Kasaiin, a cat-eared girl who writes letters to the world.
She doesn't know why she was born, nor why the world is silent.
All she knew was that the greenhouse was her home, and she and Old Dumpty had lived there for a long, long time.
Under the influence of Dr. Stubborn, she chose to leave the greenhouse she was most familiar with.
……
Envelope.
The white envelope was just like the loose white coat she wore.
On the occasion of parting, she sent the first letter and watched it fly into the blue sky, flying to an unknown place.
She began to listen to the remaining beats of this silent world.
Kasayin, she is lonely.
But is she really lonely?
The world is empty, but not without response.
Concept: Although the world is broken, it can still be filled with tenderness.
