In general, it's about these two human species, called: Black Angels and Kay.
There was a time were both species got married and had children. An organization
called The Separators didn't like to see children born as half breeds so they were
ordered to kill these families. The more they kill, the people were on their side.
The people thought it was best to be separated from each species. But now their is a
war that will decide witch species is superior.

In the present, a boy called Roy Figure starts his new day in an academy
called Lazo Academy, were the students become warriors of different type and ranks
so the can stop this war and make peace. Roy's goal is to change his life and make
friends for the first time. Little by little Roy helps his new friends with their
problems and he will do anything to keep them as friends.