A group of convicted soldier was forced to take on an experiment that will change their physicals and mental into a Hybrid human-bird like. When they found out that they were tricked to take part on a such horror experiment they start to rebel and declare a war with human. Lead by their leader, Clack they start to attack an innocence people. Meanwhile, Jack is on a mission to save his beloved one, Rin from the sky prison that was held by the Hybrid army.