In Pandora Hearts, young Oz Vessalius, heir to the powerful Vessalius Duke House, dismisses the Abyss as a mere bedtime scare. However, when the sinister Baskerville Clan disrupts his ceremony and threatens to cast him into the Abyss, Oz's world transforms. Forced to confront the reality of the Abyss and its eerie inhabitants, the 'Chains,' Oz discovers the truth behind the legends he once disregarded. With the help of Alice, a mysterious Chain known as 'Bloodstained Black Rabbit,' and the enigmatic Pandora organization, fifteen-year-old Oz embarks on a quest to unravel the mysteries shrouding his life. As his journey unfolds, Oz unravels the intricate threads of his existence, realizing a deeper purpose beyond his initial perceptions.