About "Ciel Nosurge -Ushinawareta Hoshi e Sasagu Uta-"

A "communication" game in which you interact with Ion, a girl who has lost her memories. Ion lives in a world separated from ours by 7 dimensions, which happens to be connected to our own world via a terminal. By engaging in daily activities with Ion, you eventually arrive at her Soulspace, where you can begin to recover her memories little by little. Embark on a journey to discover what this world of hers is, and why she finds herself all alone there...

Story Introduction

With its star reaching the end of its lifespan, the planet of Ra Ciela is in imminent danger of becoming completely uninhabitable. While the organization known as "Tenmon" promotes their plan to escape the doomed Ra Ciela, the opposing faction "Chimon" advocates using Song Magic to regenerate the star and the planet instead, dividing public opinion in two. Each of the organizations presents a candidate for successor to the throne -- and thus the one who will decide the fate of the planet...

[Description taken and edited from the Steam page]