Set against the vibrant backdrop of 1989 Tokyo, Lucy Fly (Alicia Vikander), a young expatriate, finds herself embroiled in a murder investigation following the mysterious disappearance of her friend, Lily Bridges (Riley Keough). The tension escalates from a complex love triangle involving Teiji Matsuda (Naoki Kobayashi), as Lucy’s world spirals into chaos.
Working diligently as a translator at Sasagawa, Lucy's life takes a dark turn when Detective Oguchi (Ken Yamamura) arrives to question her after Lily's lifeless body is unearthed mere days after her disappearance. Despite the unfathomable situation, Lucy maintains her composure, insisting she was the last person to see Lily before she vanished. She explains that she was attempting to return an item to Lily, but ultimately failed to catch up with her.
Having resided in Japan for over five years with no family nearby—her father being an electrician back home with seven brothers—Lucy feels isolated. As her past unfolds through flashbacks, we observe her initial encounter with Teiji, a photographer who, rather inviolably, captured her image without consent. Their connection deepened swiftly, blossoming into intimacy as they shared shelter during an earthquake.
Amidst taking violin lessons, Lucy’s world expands to include Lily, who she meets through a mutual friend, Bob Johnson (Jack Huston). Lucy, an introverted soul, contrasts sharply with the vibrant and outspoken Lily. Over time, Lucy introduces Lily to her world and her budding romance with Teiji, but the complexities of their relationships begin to intertwine dangerously.
Despite Lucy’s efforts, tensions rise as she attempts to persuade Teiji to sell his photographs, only to be met with cold indifference. Her jealousy and insecurities surface when she discovers Teiji had another muse, a woman named Sachi—a realization that deeply unsettles her.
As Lucy and Lily's friendship blooms, they explore Tokyo together, spending nights at Lucy’s apartment. The dynamics shift during an art festival where Bob's playful advances toward Lily reveal underlying desires, ultimately leading to a reckless encounter involving a trio that complicates their relationships even further. Lucy’s simmering anger boils when she discovers Teiji taking photographs of Lily, a betrayal that shakes her to the core.
In a pivotal moment, Lucy confesses to Oguchi that she murdered Lily, only for the investigation to reveal that the body found isn’t Lily's at all. After being set free, she returns to find Teiji, who proposes they escape together—an offer she rejects. In a fit of rage, he turns violent, prompting Lucy to defend herself; she strikes him down with a glass vase in a desperate act of survival.
Through this haunting narrative, Lucy navigates love, jealousy, and the desperate grip of betrayal, culminating in a tragedy that revels in the darkest corners of the human psyche.
