『Red String of Fate Syndrome』

A peculiar malady that suddenly appeared decades ago plunged the world into a kind of chaos.

On April 22nd of the year they turn 16, a red string appears on the ring finger of their left hand.

It cannot be cut or burned. What's more, it cannot even be touched.

This red string is invariably connected to their destined person, somewhere in the world, provided they are the same age.

No matter what happens, they are destined to marry the person they are connected to, and their happiness is guaranteed.

They are each other's good luck charm, bringing mutual prosperity.

Therefore, it was called the "Red String of Fate."

Yes... even if that person were their archenemy──.