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Long ago, humanity discovered weapons later known as Autoscrollsand the Oath-Making technology that allows command of them. In modern-day Japan, not only have Autoscrolls become a part of everyday life, but Oath-Making is now a systematized science. When high school student and scroll enthusiast of the Oath Club, Kyouta Yuzuki, gets into an accident after finding a mysterious scroll, his freshly transplanted Oath-Heart turns him into a new being!