Happy the Hero needs to collect the Three Sacred Treasures so he can get back home to Natsu and the rest of the gang. But can he defeat the mighty Leon, who can draw on the regenerating powers of the Healthy Crystal?! Happy is nearly overtaken by despair, but then a red-hot flame ignites within his heart! Why was he transported to this world to be the Hero? And what's the true nature of the human girl who's looking for his help? The secrets of Happy's Heroic Adventure will soon be revealed!