In this world where people have crystal powers, fate chose Kai to once again reunite the seven clans, who are in a constant civil war with each other for centuries. Although Kai were chosen, his path is full of despair and pain, but a voice keeps telling him; "one world, one people, one law"

Tension between her brother, a good friend and a certain Brazilian make things hard for Sarah. With these tensions will she finally be able to be what she wants most? Happy!?