A massive number of Chains suddenly appear in Reveille. According to Alice, a change in the Will of the Abyss is the cause. Members of Pandora are dispatched to stop the invasion, but their effectiveness is limited.
The Tragedy of Sablier is the key to discovering the truth. Oz and his group decide to pay a visit to Rufus Barma, the longest-living man among the Four Great Dukes. The duke they seek happens to be a bizarre round creature in a suit.
Oz and Elliot try to flee from the Citizens of Baskerville through the academy's underground passageways. They try to fight back to protect Ada, but are easily knocked away by a Citizen of Baskerville's Chain.
Oz and his group manage to sneak inside Lutwidge Academy. After overhearing a piano playing the same tune as the music box in his pocket watch, Oz makes his way to the school library, where he meets Elliot and Reo.
With Sharon missing, Break hurries to her rescue. Though he makes an irreplaceable sacrifice, Break manages to save her. Afterward, a single letter finds its way into Oscar's hands that would soon cause a great commotion.
Oz and Alice narrowly escape Cheshire Cat's dwelling before it implodes on itself. They find themselves in the meeting room where the Four Great Dukes have gathered. Break also returns to the real world, but is informed that Sharon has gone missing.
Oz gets transported to a dimension created from Alice's memories. There, he witnesses a shocking scene from a certain event from the past. As if resonating with his subconscious, B-Rabbit's powers begin to go out of control.
After getting separated from Gilbert, Oz is still being pursued by Cheshire Cat. A mysterious man from Alice's memories appears and pulls Oz inside a mirror. After reuniting Oz and Gilbert, this man requests that they go and help Alice.
Break and Alice are missing. Oz asks Sharon to help find them. Using Sharon's Chain, they make their way into the dwelling of Cheshire Cat. They manage to escape at the last minute, but Oz and Gilbert get separated in the process.
Philip's father is an Illegal Contractor. B-Rabbit's attacks hurt the Chain and the Illegal Contractor equally, causing Oz to stop Alice by force. Oz sees himself in Philip and tries to convince Philip's father to mend his ways.
A stuffed rabbit appears before Alice while she was feeling lonely at the mansion. The rabbit mocks her and disappears before is reveals what it is. Alice realizes that a piece of her memory is locked away somewhere inside the mansion.
Oz returns to the mansion where his coming-of-age ceremony was held in an effort to find clues regarding Alice's memories. This mansion had remained under Pandora's jurisdiction ever since Oz had been sent to the Abyss.
After returning from the Abyss, Oz finds himself at one of the Rainsworth family's mansions. He is welcomed by Sharon, Break, and Raven, who inform him that Pandora, an organization formed by the Four Great Dukes, are after him.
Before Oz's coming-of-age ceremony, he isr introduced to Duchess Rainsworth's granddaughter. Oz instantly falls in love. As he recites his oath, the Silent Clock moves for the first time in 100 years. The bell rings as intruders interrupt the ceremony.
While exploring a mansion Oz Vessalius, heir to the prestigious Vessalius family, hears the sound of a music box. Drawn to the melody, he discovers a grave. When Oz touches the pocket watch on that grave, his mind gets sent to another world.