Hero of Fire is doing the storyline. No main quest, but a storyline. As you improve your level, you learn more of the struggle of Zelonion.
Side quests are there for experience, items, and hints that shall guide you through the campaign.
When we have completed the game, we will release our final patch, which includes the final chapter and it's boss. Upon the bosses death, what shall you see? What shall you receive? We don't know. Not even WE are that far =D