Intro. Japan, year 2601
In a world where AI and robots have become just tools for humans. Few people believe that They may actually have "hearts".
My father—a top robotics engineer. is one of those people And because of that belief He was killed in front of his eyes.
The last gift he left behind. It's not money, it's not secret information. But it's an AI girl. In the laboratory under the house.
Her name is Rena
Reina is not like other robots. You can laugh, I wonder. Ask questions about life and look at the world like a child who has just opened his eyes to see the world for the first time.
But she only had one month to live.
My duty is to teach you. About the world, feelings and the meaning of living
But as time passes The line between "human" and "AI" It began to fade away.
and I have to choose that will take the rest Teach her to understand life.
or Will challenge the whole world To let you live forever.
This is the story. between high school students in Tokyo with AI girl I want to know that
"What does it mean to be alive?"