[2] It is the theme song to the anime film adaption of King of Thorn.

"Edge of This World" was composed in the key of E minor and set to a common time tempo of 123 beats per minute.

Misia describes it as an "edgy ballad" with a "dark electro and house" sound.

Misia has stated that the message expressed in her lyrics, that you can "shape the world to your desires", is a direct reflection of her feelings at the time and what led to creating the soulful R&B sound of Soul Quest.

[4] King of Thorn director Kazuyoshi Katayama has stated that he never considered anyone other than Misia to sing to theme song to his film.