Three Hundred Years After the Death of the Brave Man

A long time ago, the world was saved by a brave man. The brave man promised all living beings that they would have enough food, clothing, and warmth, and live and work in peace and contentment. A long time ago, there was a song. You and I are brothers and love each other. Pick fruits, brew wine, and harvest grains. Share with each other, regardless of you or me. ... Until three hundred years after the death of the brave man... (This is a story about a time traveler saving the world.)