Little Town Hero

The story is set in an isolated village on the edge of the world. The only gate leading outside is heavily guarded by a castle, and the villagers are not allowed to leave. Most of the villagers dont give it a thought, and happily go on with their everyday lives. However, the protagonist is a little different from the others - he wants to see the world outside. One day, a "Monster" appears in the village, shocking everyone because until then, no one knew such creatures existed. The protagonist is...