Under the guidance of Menell, Will goes to a village that has been attacked by monsters. As he subdues the remnants of the demons, the tragedy of the village gradually becomes apparent. A house burned down by piled up corpses. And it was a boy who was burned by flames and turned into an undead (undead) who called out to Menel with a thin voice.

Will and his friends, who travel with Bee and Tonio, finally arrive at the target "City of White Sails (White Sails)". Will is impressed by the big city he sees for the first time and the people who live there. When healing the tiredness of his travels, the bell of an emergency rings. Looking out in a hurry, a big black shadow crosses over their heads--

Will, who was to have an audience with the lord Ethelwald as a "Killing Wyvern," offers to gather private soldiers to eliminate the frequent damage caused by monsters. Ethel once shows an intimidating attitude to such an outlandish offer, but decides to identify Will and forgive it. Head to a bar where adventurers gather to find friends to fight with.

Will, who was appointed as a paladin, was responsible for the reconstruction of the village and the extermination of demons. One day, he goes to "Beast Woods" with Reistov and Menel, who have two names, "Tsuranuki", in order to search for a unit that does not return. He feels something is wrong with the scattered bodies and proceeds to the valley in the back ...

Will and his friends are addicted to the traps of the demons and have routed. After seeing the seriously injured Menel, Will realizes that he has unknowingly put his companion in a dangerous eye, and realizes the difference in ability between his surroundings and himself. It was Menel who showed anger that stood in front of Will who was going to defeat the demon beast alone.

威爾與梅內爾發現至今各地發生災難，原因皆是來自矮人之國的鐵鏽山脈，便持續展開進一步調查。某天，兩人進行每天必做的鍛鍊，發現有一位矮人躲在樹叢裡窺探。威爾以為他有興趣，便主動搭話，但是那位矮人卻欲言又止，然後拔腿就跑。

野獸森林出現不死族，引發一陣騷動，實際上卻是不死神斯塔戈內特的神使為了引誘威爾過來所設下的陷阱。威爾提高戒心，然而斯塔戈內特只是想給他忠告，避免與邪龍維拉奇爾卡交戰，養精蓄銳。就在這時，維拉奇爾卡的咆哮響徹森林……

威爾等人懷著討伐龍的決心，從燈火河港出發，前往鐵鏽山脈。威爾為了反將惡魔們一軍，決定從河川支流逆流而上，繞至山脈的另一側入侵。在途中，威爾順路拜訪了自己的故鄉——死者之街。睽違兩年與伽斯重逢，滿心喜悅，但是……

威爾與維拉奇爾卡激烈交戰，被逼入絕境。愛用長槍斷成兩截，魔劍也遭到封印，連古雷斯菲露的結界都被粉碎。這時出現在他面前的是不死神矢塔古耐特。矢塔古耐特讓黑鐵之國的昔日矮人戰士復甦，古雷斯菲露鼓舞不復輪迴的戰士們，在威爾等人心中點燃「勇氣」。威爾一行人再次站起，重新下定決心，挑戰最強敵人──維拉奇爾卡！