In a lifetime you need to have a soulmate some of the soulmate can be dead ,or ANYWHERE in the world so you find your soulmate with a rainbow string that random Cupids choose your lover but there's a catch of you want to tell your soulmate that you want to break up with the person the person who wants to break up with you they would die( I wanted it 2 be different) and it start off with two and x ( yes there together in this au and four and six I am sorry) and they get there soulmate at the age 18 and four and x Where soulmate but x couldn't accept it and four had developed feelings for the x but then he gets the hanahaki disease can you think he would make it on time before he would be gone ?( there humanized sorry if you don't like it)
3 parts