Noumi Hasegawa is a 13-years-old boy who wants to become a pianist. One night, he sees a ray of light floating in the sky. This marks his encounter with a mysterious girl called Eon. She starts living with him, and together they discover the true magic of the city they live in...

[translated and edited from official website]

This was the second kinetic novel released by Visual Art's, after "Planetarian".