Meth-E-Meth: The Complete Edition (manga)

Long ago, humanity discovered weapons called golems and developed the means to command them: Oath Magic. The dolls quickly grew to be a part of everyday life under a new name—Autoscrolls—and Oath Magic became an academic discipline. Ordinary high schooler and oath club member Kyuuta Yuzuki specializes in writing oaths, but when a strange scroll falls from the sky, curiosity gets the better of him. He places the mysterious item in an Autoscroll…which suddenly takes him out with a lethal attack! Kyuuta miraculously awakens, only he now has a most unusual heart in his chest, a new protective classmate, and two organizations showing keen interest in him…