Sixth-grader Yuuma Ashihara and his twin sister, Sawa, are playing Actual Magic, a brand-new virtual reality MMORPG, when it suddenly starts merging with the real world. Amid the chaos and confusion, it becomes clear that death is lurking around every corner, including when Yuuma encounters his classmate Sumika. Previously, she was one of the cutest girls in his class, but she has since undergone a terrible metamorphosis—into one of the game's horrifying monsters!