“狩龙人”是挥舞银剑将龙猎杀并获取报酬的职业。武艺不精的狩龙人少年·拉格纳和狩龙数遥遥领先其他人的天才少女·蕾欧妮卡组成搭档，日复一日地讨伐着龙。拉格纳的心愿只有一个——“不变强也没关系，只想一直待在蕾欧身边”。然而，在远比之前遇到的龙强大的“高位龙”的袭击之下，他的梦想化为泡影。在强大敌人的面前，拉格纳脑中闪过近日困扰他的噩梦——那是虽然获得了最强的力量却无人可以保护，行走于绝望孤独的未来的自己。未来的自己诉说了什么？现在的自己应该选择哪条路？随后，拉格纳与谜团重重的新搭档·绯红一起，为回避绝望的未来踏出了第一步。挑战绝对的强者，反抗强制的命运，突破极限——超克己主义异世界极限战斗！！
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