Mary Skelter reaches its final chapter in a dark tale set within Jail, a living prison buried 666 meters underground that suddenly appeared decades ago. This prison gave rise to monstrous Marchen and is patrolled by madness-inducing Nightmares. A group of prisoners—Jack and the Blood Maidens—are reincarnations of fairy tales who dared to escape, climbing from the tower's depths toward the surface filled with hope. However, outside awaited a sea of blood-soaked corpses and the sinister Massacre Pink, shattering their hope and scattering the group. Among them are Pyre, a Massacre Pink assassin; Jack, a boy who sacrifices his blood for others; Mary, the little match girl whose flame reveals the truth; Toh, a mysterious boy claiming to be Jail; Red Riding Hood, a girl anguished by her feelings; and Clara, an ordinary girl. Separated, they are each drawn to the floating Eating Jail in the sky, as this marks the dramatic finale to the tale of the Blood Maidens.