In the future, the streets of Tokyo are patrolled by RAPT, the organization responsible for maintaining peace and order, but buried deep underground in secret labs, monsters of unimaginable terror are being forged to ensure a future devoid of free will. In response, four brave angels set out to defend the defenseless and bring down the underground crime syndicates, as well as the corrupt leaders of RAPT. They are the best chance a wounded city has of freeing itself from an even darker future.