In this world, some people have their own mate, the arrival of the mate is like a red circle or you could say a red string wrapped around the little finger, people who get this can't sleep peacefully unless they meet their partner/mate.

Now you are with your brother Nagi Seishiro who brought his close friend Reo mikage, you see that the red rope suits you,

Reo looks at you intently, Reo's face is very tired and he wants to hug you