Seven Law students from the University of Tokyo expected a simple field trip to further their prestigious careers. The group is split by a quiet tension: on one side are the lively, tight-knit friends who value laughter and movies; on the other are the "Elite" scholars led by the brilliant Kaito, students who carry the heavy attitude of those destined for the Supreme Court.

Their rivalry is cut short when their bus plunges through a strange purple fog, crashing onto the shores of a desolate, gray island.

This is the Island of Magical Sins—a lawless dumping ground for the world's most dangerous criminals. In this twisted reality, the legal codes they spent years studying are useless. The "Elite" try to maintain order with logic, while the others spiral into panic, realizing that on this island, "magic" is the only law that matters, and it belongs to the monsters lurking in the ruins.