Marina was captured by the evil organization Guild and nearly transformed into a female cyborg warrior, but she escaped before an evil circuit could be implanted into her brain, and has since continued fighting against the Guild. Her older sister, Reina, was also captured by the Guild and implanted with a demonic circuit—when activated, she becomes inhumanly violent. To save her sister, Marina engages in a life-or-death battle with the Guild. One day, she finally reunites with Reina, but Master Dark, the Guild's leader, activates a special sound wave that triggers Reina's evil circuit, causing her to go berserk and capture Marina. Bound and restrained, Marina is beaten with iron pipes by soldiers, then subjected to brutal torture as Master Dark installs a mechanical device into her chest, causing excruciating pain. Metal chains spiral around her groin and thighs, choking her neck while she is relentlessly flogged with a whip. Reina suddenly appears and attempts to heal Marina's wounds, and for a moment the evil circuit deactivates—Reina regains her senses, and the two manage to escape. But soon after, Reina goes on a rampage again, capturing Marina with a neck-hanging tree device and subjecting her to degrading torment. Eventually, Marina is reduced to a living doll, her body violated by soldiers, her abdomen slashed open, and even the mechanical components implanted in her body are destroyed.