SkyBreaker

Year 1097:
War between two clans, the Mortelith Clan from Skysea City and the Valeguard Clan from Dragon's Cove had broke out.
The war raged on for 9 years, and the Northern Islands were being torn apart. House were being blown apart, towns being dragged underground, civilians either chose a side or they were killed.

There were no signs of it stopping, until eventually the Guardian Of Death, King Mortegarde, ended the war with one stroke of his sword, killing the two crooked clan leaders and leaving everybody else to right their wrongs.
King Mortegarde died in the process, and thus the islands were left without a leader, and lived in peace.
It is said that anyone who can wield the War King's Sword will gain the power to start and stop a war with just one stroke.

Present day:
Lake, an everyday swordsman from a faraway island, meets an organisation named V.O.I.D, and teams up with them to attempt to stop a new gang of war criminals from finding Mortegarde's sword and restarting the war.