The season follows Oz's displacement into the Abyss, his partnership with Alice, and the gradual connection between their memories, the Tragedy of Sabrie, and Jack's historical influence.
Story Structure — 5 Plot Phases
The Abyss Opens
Oz's coming-of-age ceremony collapses when the ancient clock rings and he is cast into the Abyss. There he meets Alice, whose Black Rabbit form saves him and whose identity becomes central to the story.
Key Events
Birthday Grove Discovery — Oz discovers a hidden grave and takes a pocket watch attached to it, triggering a disturbing vision. Characters: Oz VessaliusLocation: Secret grove
Ceremony of the Abyss — Oz's oath causes a clock silent for one hundred years to ring, after which strange figures attempt to cast him into the Abyss. Characters: Oz VessaliusLocation: Coming-of-age ceremony
The Black Rabbit Appears — Alice appears as the Blood-Stained Black Rabbit and fights to prevent Oz from being pulled into the Abyss. Characters: Oz Vessalius, AliceLocation: Ceremony grounds
Abyss Arrival — Oz falls into the Abyss, explores its repetitive landscape, and is attacked by dolls before receiving help from the Black Rabbit. Characters: Oz VessaliusLocation: The Abyss
A Contractual Investigation
Oz and Alice begin investigating illegal contractors while Pandora explains the larger conflict surrounding the Abyss. Oz also discovers that ten years have passed and that his memories no longer match the world around him.
Key Events
Alice Names Herself — Alice tells Oz to call her Alice, and his initial fear begins to soften during their conversation. Characters: Oz Vessalius, AliceLocation: The Abyss
Pandora's Explanation — Oz learns about Pandora, its investigation of the Abyss, and the threat posed by the Baskervilles. Characters: Oz Vessalius, AliceLocation: Pandora facility
First Contractor Mission — Oz and Alice begin a mission to investigate an illegal contractor and learn about the danger of unauthorized contracts with Chains. Characters: Oz Vessalius, AliceLocation: Nearby town
Abandoned Mansion — Oz returns to the mansion from his ceremony and finds it deserted and worn down, confronting the gap between memory and present reality. Characters: Oz VessaliusLocation: Vessalius mansion
Trauma and Power
A contractor case forces Oz to confront memories of family rejection and his instinct to sacrifice himself. Alice's power becomes both a danger and a means of survival as their partnership deepens.
Key Events
Ten-Year Displacement — Oz realizes that ten years have passed during his absence and that the person connected to his childhood has changed with time. Characters: Oz VessaliusLocation: Abandoned mansion
Questions of the Abyss — Oz confronts questions from the Will of the Abyss and begins to reconsider the meaning of his presence and his connection to Alice. Characters: Oz Vessalius, AliceLocation: Dream dimension
The Contractor Case — Oz helps a child from a fallen noble family while investigating a contractor whose actions connect personal grief to the Abyss. Characters: Oz Vessalius, AliceLocation: Poor town district
Alice's Power Suppressed — Oz suppresses Alice's power while confronting the child's father, revealing how strongly personal family trauma affects his decisions. Characters: Oz Vessalius, AliceLocation: Contractor's estate
Jack's Intervention
Jack takes control of Oz's body and reveals that the historical crisis connected to the Abyss is not over. His intervention sends Oz into Alice's memory and ties their personal stories to the Tragedy of Sabrie.
Key Events
Jack Takes Control — Jack takes control of Oz's body and addresses Pandora, revealing that a major historical threat may still exist. Characters: Oz Vessalius, Jack VessaliusLocation: Pandora meeting
Alice's Memory Prison — Alice becomes trapped in a memory-based dimension, while Jack directs Oz toward the memory where Alice needs help. Characters: Oz Vessalius, Alice, Jack VessaliusLocation: Memory dimension
The Dead Alice Vision — Oz sees an image of Alice dead inside the memory, and the shock destabilizes him and awakens destructive power. Characters: Oz Vessalius, Alice, Jack VessaliusLocation: Memory of Sabrie
Memory Dimension Collapse — Oz begins destroying the memory dimension while trying to remove Alice's fear, and Jack's intervention helps redirect the crisis. Characters: Oz Vessalius, Alice, Jack VessaliusLocation: Cheshire's dimension
Unresolved Inheritance
The investigation expands through Alice's memories, the academy conflict, and a large Chain attack. Oz and Alice save a child together, but the season closes with an unresolved rumor linking Oz to Jack.
Key Events
Sabrie Truth Emerges — The destruction of a key memory object exposes more information about the Tragedy of Sabrie and its connection to Alice's past. Characters: Oz Vessalius, Alice, Jack VessaliusLocation: Pandora investigation
Latowidge Abduction — Oz and his sister are captured beneath the academy, and Oz is challenged over his repeated willingness to sacrifice himself for others. Characters: Oz VessaliusLocation: Latowidge Academy
Burning City Assault — Oz saves a child during a large Chain attack, and Alice uses her power to save Oz and return the child to a parent. Characters: Oz Vessalius, AliceLocation: Burning city
Reincarnation Rumor — Oz returns home as new information raises the possibility that he is connected to Jack through reincarnation, leaving the season's central mystery unresolved. Characters: Oz Vessalius, Alice, Jack VessaliusLocation: Vessalius home
Story Breakdown
Ceremony and Descent — Oz's birthday ceremony activates the ancient clock and sends him into the Abyss.
Pocket Watch Vision — Oz removes a pocket watch from a grave and experiences a vision of violence.
Clock Awakening — The silent ceremonial clock rings and strange figures attempt to cast Oz into the Abyss.
Alice's First Alliance — Oz meets Alice in the Abyss and gradually accepts her despite her terrifying Black Rabbit form.
Black Rabbit Rescue — Alice saves Oz from attackers and prevents him from being lost in the Abyss.
Shared Investigation — Oz and Alice leave the initial crisis behind and begin investigating illegal contractors.
Ten-Year Displacement — Oz discovers that his disappearance caused a major gap between his memories and the present.
Abandoned Mansion — The mansion from Oz's memories is now deserted and deteriorated.
Changed Relationships — Oz confronts the fact that people connected to his childhood have changed during his absence.
Contractor and Family Trauma — An investigation into an illegal contractor forces Oz to confront rejection and his tendency toward self-sacrifice.
Child in Poverty — Oz protects a child whose noble family has fallen into poverty.
Power Suppression — Oz restrains Alice's power while confronting the child's father.
Alice's Memory Crisis — Alice's fragmented memories become a dangerous world connected to the Tragedy of Sabrie.
Memory Dimension — Alice becomes trapped in a dimension created from her memories and fears.
Dead Alice Vision — Oz sees Alice apparently dead and loses control of his emotions and power.
Jack's Historical Shadow — Jack directly intervenes through Oz and links the present investigation to unresolved historical events.
Body Possession — Jack takes control of Oz's body during a Pandora confrontation.
Reincarnation Rumor — The season ends with a rumor that Oz may be connected to Jack through reincarnation.
Escalating Chain Threat — The personal mystery expands into public danger as Chains destabilize cities and threaten civilians.
Academy Abduction — Oz is captured beneath an academy while his willingness to sacrifice himself is challenged.
Burning City Rescue — Oz and Alice cooperate to save a child during a large-scale Chain attack.
Oz Vessalius, heir to one of the duke houses, has just turned fifteen. His life is rich and carefree, darkened only by the constant absence of his father. At his coming-of-age ceremony, however, everything changes. For no reason that he can discern, he's cast into the prison known as the "Abyss", only to be saved by a "chain" known as Alice, the bloodstained black rabbit. It is unknown why was he cast into Abyss, how does Alice factor into it all, and what does the organization known as "Pandora" want with him.
