That day, the country of Aitriss was covered in uttermost darkness. There was no warning when the “Gates of the Other World” suddenly appeared in the royal castle. Then, powerful monsters gushed out one after the other, trampling the castle garrison. —The royal castle quickly fell. And slowly but surely, darkness ate into the country. However, there is still hope. The two shadows who escaped the royal castle covered in flames were Shion and Liane, the children of the late king. And then, the thread of fate spun by the legendary heroes began to spin… Carrying the “Fire Shield” given to them by their mother, the two heroes’ journey to confront the powerful darkness begins here.