The minor nation of Siltran, with the aid of the Naofumi's village, has managed to drive off the assault of the massive nation of Piensa. But Piensa then begins to invade the nations that have come seeking an alliance with Siltran. Some of Naofumi's allies who are scouting Piensa get caught up in the chaos and are badly injured as a result-and to make matters worse, the injuries as marked as incurable, unable to be treated even by the Shield Hero no matter what Naofumi tries. Could Naofumi's brave determination lead to the discovery of new powers?