Protect the Spirit's Sword

Long ago, a giant drove his sword into a rock, ordering that it be guarded, so as not to allow humans to lose their spirit. But enemy forces have learned of this, and now are determined at all costs to conquer the magical sword, thereby depriving people of their spiritual strength. You are a lone warrior standing on the last line of defense against the villains, and you have the strength of a hero, which, as we hope, will allow you to drive away the villains and stand firm in this free online battle!