Lucy Maud Montgomery/Synopsis

The Guild Arc
Lucy accompanies Francis Scott Key Fitzgerald during their visit to the Armed Detective Agency in Yokohama. After the meeting, Kenji Miyazawa is ordered to send them off in the elevator. Lucy compliments his hat, after which he vanishes inside the elevator. The following morning, she also captures Naomi Tanizaki while she, together with Atsushi Nakajima and Jun'ichirō Tanizaki, searches for Kenji.

Lucy soon transports Atsushi, Tanizaki, and other civilians to her dimension. She shows the detectives their captured comrades and asks them to play with her ability, a gigantic doll-like creature named Anne. If they defeat her, Lucy promises to set their subordinates free. The other civilians flee from the room, leaving only Atsushi, Tanizaki, and a doctor behind in the dimension. As soon as Atsushi and Tanizaki accept her challenge, Anne instantly captures Tanizaki and imprisons him.

Lucy praises Atsushi's athletic reflexes in dodging Anne's onslaughts, where he eventually acquires the key to the prison room. However, Lucy admits that she herself does not know to use the key. To her surprise, Atsushi runs towards the exit that will cause him to lose his memories, but the doctor stops him to offer him advice. After their discussion, Atsushi gets caught by another Anne and is dragged into the prison room. Lucy then turns to the doctor, at whom she and even Anne get frozen in fear due to his strong murderous intent.

He soon reveals to Lucy the truth: Tanizaki has projected an illusion of the door shutting close, while Atsushi resists getting dragged to the prison room with his tiger limbs. Atsushi also reveals having tied a ribbon on Lucy's waist earlier, then pulls her towards him and demands she deactivate her ability. Otherwise, he will drag her together with him to the prison room. As Atsushi lets go, Lucy deactivates her ability and brings back the imprisoned people back to reality. Lucy is then approached by an apologetic Atsushi, but she flees from him in tears. She apparently returns to the Guild to report her failure. Though Fitzgerald believes that users whose abilities have been uncovered are useless, he allows her to stay in the Guild after she begs so, albeit demoting her as a servant.

When Atsushi is abducted to Moby Dick, Lucy encounters him in Fitzgerald's office. Later, as Atsushi gets locked up, Lucy passes by his cell and mocks him on her way to burn Q's mutilated doll. Atsushi asks her to set him free for everyone's sake, but Lucy declines. He then advises her to run, but she tells him how the Guild is the only thing she has left, unlike someone blessed like him. She shows him her scarred arm that was caused by the painful time she had on the orphanage, to which Atsushi shows his identically scarred abdomen and thereby relates to her story as someone who also experienced the same unbearable acts in the past. Though he knows how they both experienced loneliness, Atsushi believes that leaving the people below to die is akin to abandoning their past selves.

Quickly bringing him to her dimension, Lucy tells Atsushi that there is no other way to stop the curse, but he states that Dazai's nullification ability can stop it if he touches the doll. Lucy tries to dissuade him given the dangers that might befall him on the way down, but Atsushi remains steadfast in his plan, recalling a quote he once read in which regrets are a product of not doing anything. Lucy then decides to help him as Anne hands him a parachute, asking Atsushi to save her soon. As she promises to wait for his return, Atsushi jumps off the aircraft and agrees to come back for her.

After the Guild members evacuated from the Moby Dick, she is seen tied up and being escorted out of a helicopter by Twain. She then along with the other Guild members are seen driving away in a car.

The Guild Aftermath Arc
After the Guild war, she is seen with a metal box, but when she sees Atsushi she runs away. Later on, she comes out as the new waitress of Café Uzumaki and throws the metal box at Atsushi while blushing.

She is later seen glaring at Atsushi and Kyōka as they enter the cafe. She takes their orders and gives a dispatch for Kyouka, a report about her parents. But one page of the report is missing and they go out to find it. Lucy turns out to have the missing page and throws it into a river for Atsushi to catch. Atsushi finds the page but gets tangled in a bunch of chains. Lucy then jumps into the river to save him. As she brings the both of them to her dimension, Atsushi thanks her and admits that he searched for her in Moby Dick after all. He then suggests a way for them to dry their clothes instantly with her ability, only for it to fail and embarrass Lucy.

When she kicks him out of her dimension, the two regroup with Kyōka, and they locate the boat containing the briefcase. After the obtaining the document, realizing that Kyoka's ability which she long thought killed her parents was actually a sign of her parents' love, Lucy drags Atsushi out of the café to give Kyōka some time alone.

Lucy lets Atsushi and Kyōka try out her coffee; he compliments it, though Kyōka finds it average. The latter further remarks that, if such coffee costs the same as the manager's, their customers will not go along with it, much to Lucy's annoyance. When Atsushi asks if anyone in the Guild made coffee, Lucy remembers Louisa often making it and describes her to be a good person to Lucy. Atsushi then thinks how they are good friends, though Lucy shyly denies it. She also recalls how Louisa has never used her ability on herself, probably because she does not consider herself important.

Cannibalism Arc
Lucy looks after and takes care of Yukichi Fukuzawa in Anne's Chamber after he was infected by the Cannibalism virus and to prevent him being attacked by the Port Mafia. She further tells him that Atsushi came running to her to help him. Despite asking him not to move in his feverish condition, Fukuzawa tells her that they must not fight with the Port Mafia over his life in order to protect Yokohama's balance and peace.

After Fukuzawa heard about the events on the outside, he tries to leave. However, Lucy tells him that she is not a member of the Agency and will not prevent him to leave; instead, she asks what will be his plan once he steps out of the room, to which Fukuzawa responds that he will see an old friend.

Decay of Angels Arc
When the Armed Detective Agency is wanted for terrorism, Lucy marches into the Special Division for Unusual Powers headquarters and threateningly defends the Agency's innocence, primarily Atsushi's. A passing Ango Sakaguchi notices her and takes her into custody.

Later, Atsushi, Kyōka, Ango, and Mushitaro Oguri arrive in her dimension. Lucy instantly reprimands Atsushi for getting wanted, though she soon gets flustered after Ango reveals how she caused a ruckus at the Special Division in defending the Agency. After Mushitaro states the plan of the Decay of Angels of eliminating the country within ten days courtesy of the page's back page, Lucy tries to console Atsushi and Kyōka. To her surprise, they express relief on the matter, as they find hope in having to retrieve the said page within the time limit and write that the Agency has been falsely accused.

In a back alley, Ango plans an infiltration mission with Lucy, Atsushi, and Kyōka, which is to halt the enemy's third stage and to retrieve the page from the enemy. Ango deems Lucy to be the heart of their strategy, with her ability vital in infiltrating the enemy without being noticed. Atsushi apologizes to Lucy for getting her involved, but Lucy shrugs it off. Per Dazai's plan, they are to head to the Sky Casino whose coin bombs shall be used by the terrorists to cause firsthand slaughters and an economic halt that might possibly cause a global economic crisis. Hence, they are to capture casino manager Sigma, a Decay of Angels member who knows the page's location; prevent the terrorism; and gain the Hunting Dogs as allies.

Upon Ango's order, Lucy transports Atsushi and Kyōka to Anne's Chamber and heads to the casino. As they arrive at the Sky Casino, they hear an explosion go off which Lucy notes have sealed all exits. Kyōka notes that their only way out has been cut off, to which Atsushi quips that they are now trapped with their opponents, which goes according to plan. Eventually, after Sigma lets go of Atsushi's hand and falls off the casino, Lucy is notified by Ango of Atsushi's dire situation hanging by a ledge. With no resources to grab him by, Lucy jumps off the casino to bring him and herself to her dimension.

As he thanks her, Atsushi tries to shield Lucy from Hawthorne, realizing that the latter connected a thread of blood onto him to enter the chamber. Though Lucy is wounded, Anne captures Hawthorne, imprisoning him into her secret room. Lucy rejoices with capturing their enemy, but Ango tells them that they failed to retrieve the page's location and are even witnessed by the Hunting Dogs saving Sigma, a "fellow terrorist" in the government's eyes. He fearfully regrets that everything played out according to Fyodor's schemes, ending in their utter defeat and failure.