Sixty years ago, a powerful team of Braves had annihilated the monster forces. However, sixty years later, the monster resurrected. The Brave who had already become an old man made up his mind to once again embark on his youthful journey. Along the way, he encountered many difficulties, but the heart of the brave gradully became full of vigor. The deeds of the old Brave inspired the people. Everyone began to pick up their weapons to fight against the monster.