Heartsplit focuses on the idea of "The Narrative", which is a sort of red string of fate situation. The shortest way to explain it is that the Narrative in Heartsplit is sentient and aware. The Narrative expresses itself through the forms of Zephyr and Iruiel, as well as through the triplets Willow, Thyme, and Sage, who were created by Zephyr for the express purpose of ensuring that the Narrative continues as has been determined.