Long ago, humanity discovered the weapons later known as Autoscrolls—and 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 new transplanted Oath-Heart turns him into a new being!

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