Seventeen-year-old Ren Kurogane wakes inside Bloodlock Academy, a massive prison disguised as a prestigious school. Every student stands accused of a crime they cannot remember committing, and their sentence ends only when their secret is revealed. Each prisoner’s supernatural Scar is born from trauma, granting power while destroying the body. Ren’s Bloodforge weaponizes his blood and absorbs other Scars, making him a resource to the academy’s masked administrators. Forced through brutal Judgment Games, Ren uncovers a message claiming he was imprisoned not for committing a crime, but for surviving one. The academy is a laboratory, and every prisoner was selected for a reason.