1st Prince Taehyung and 2nd Prince Seungmin sons of Emperor Soobin was sent to train together with the sons of the other Clans in order for them to maintain the relationship of their clans. They were train just for the sake of their parents interest and for the relations of their clans but who would thought that their training will be applied in real combat a real battle. All Eight of them was sent to fight King of Demon's Pirates Viruzka and his subordinates. The Eight of them have each others back in times of good and bad circumstances and who would expect the friendship would turn to something else.