In this universe everyone has a soulmate waiting for them in the form of a red string of fate. This string only appears however when you have met that person for the first time.

For years you figured you would never find your own, after all Teyvat is big... there's so many people in the world. Yet one day when in Mondstadt you ran into a bard and your life changed forever. That red string appeared binding your souls together....

There is no way to break or change a soul mate bond. When you spend too much time apart or go too far you will both feel pain; closeness and physical contact cures this. How will you deal with finding out your bond is a mysterious bard?