Hooked

Hooked, published in Japan in 2015 as Nile Perch No Joshikai, is a psychological thriller by Asako Yuzuki, author of the international bestseller Butter. The novel follows Eriko Shimura, a successful but deeply lonely career woman who develops an intense obsession with Shōko Maruo, a carefree lifestyle blogger. After orchestrating a meeting, Eriko’s fixation escalates and their burgeoning relationship devolves into a dark, manipulative struggle for control that pushes both women to their breaking points. The narrative explores themes of The Alienating Nature of the Modern World and The Dangers of Parasocial Relationships, examining how digital personas can foster delusional intimacy and invite obsessive attachment.

For Hooked, Yuzuki received the prestigious Yamamoto Shūgorō Prize, one of Japan’s major literary awards. Her work has gained significant international acclaim, particularly with the English translation of Butter, which was named Waterstones Book of the Year in 2024. Hooked was also adapted into a Japanese television drama in 2021. The novel uses recurring motifs of invasive species and mislabeled seafood to probe The Impossibility of Self-Actualization Under Patriarchy, suggesting that societal pressures force women into unnatural, competitive ecosystems that sabotage female solidarity. Through its depiction of a friendship turning toxic, the book critiques the cultural tropes that frame female relationships as inherently fraught with jealousy and rivalry.

This guide refers to the 2026 Ecco edition.

Content Warning: The source text and this guide contain depictions of bullying, emotional abuse, physical abuse, sexual content, disordered eating, and mental illness.

Plot Summary

Eriko Shimura is a thirty-year-old, highly successful employee at the Nakamaru trading company. Beneath her immaculate exterior, however, lies a deep loneliness and an inability to form lasting female friendships. Her life revolves around her demanding job and the pristine apartment she shares with her parents in Tokyo. To fill the void, Eriko becomes obsessed with The Diary of Hallie B, The World’s Worst Wife, a lifestyle blog by Shōko Maruo. Eriko idealizes Shōko’s seemingly carefree and authentic life, which stands in stark contrast to her own rigidly controlled existence. 

After deducing from blog posts that Shōko lives nearby, Eriko orchestrates an encounter at a local café. The two women connect and a subsequent late-night outing at a Denny’s deepens their bond. They talk for hours and Shōko gives Eriko a ride home on the back of her bicycle, a moment of deep joy for Eriko. Outside her apartment, however, she is confronted by her estranged childhood friend, Keiko Ogasawara, whose bitter remarks foreshadow trouble. The burgeoning friendship soon falters when Shōko must travel to her family home after her stepmother leaves her father. Shōko forgets her phone, cutting off all communication for several days. Eriko, consumed by worry and fueled by a lie Shōko told about receiving threatening messages, uses clues from the blog to locate Shōko’s apartment, convinced she is saving her from a stalker. When Shōko and her husband, Kensuke, return from a simple errand, they are met by a frantic Eriko, whose obsessive concern frightens them.

The dynamic between the women shifts irrevocably. Shōko, unnerved by Eriko’s intensity and the flood of messages she sends, begins to withdraw. They meet at a conveyor-belt sushi restaurant, but the dynamic between the two women has changed. Eriko’s attempts to display her knowledge by revealing trivia about the fish they are eating only alienate Shōko further. Feeling rejected, Eriko’s behavior becomes more erratic. She ambushes Shōko at Denny’s again, launching into a long, critical tirade about Shōko’s life, her laziness, and her choices, all under the guise of being a concerned friend. Horrified by the verbal assault, Shōko cuts off all contact, blocking Eriko’s calls and texts. 

Ostracized and desperate, Eriko begins a campaign of online harassment, posting a deluge of comments on Shōko’s blog from anonymous accounts, which vacillate between pleading for forgiveness and launching vitriolic attacks. Meanwhile, Shōko has a chance encounter with Keiko, who reveals the full story of her own terrifying friendship with Eriko in high school, which culminated in Eriko spreading a false rumor that Keiko was engaged in compensated dating with an older man. Shaken, Shōko also befriends Nori, a superstar blogger who advises her to professionalize her blog and ignore the negativity caused by fans. As Shōko’s blog content becomes more polished and less personal, it infuriates Eriko, who feels she is losing the Hallie B with whom she fell in love.

Eriko’s obsession takes a toll on her career. Her work performance plummets and a desperate, ill-advised one-night stand with her colleague, Yasuyuki Sugishita, ends in humiliation. The affair is discovered by Sugishita’s secret girlfriend, an office temp named Maori Takasugi, who confronts Eriko in the office. In a verbal and physical assault, Maori exposes Eriko’s privilege and social ineptitude, demanding as penance that Eriko have sex with all 23 men in their division. Eriko flees the office in terror and is placed on an extended leave of absence. During this time, she tracks Shōko via a tweet to a Shinjuku aquarium. There, she discovers Shōko kissing a young waiter, Hashimoto, in front of the Nile perch tank. Eriko takes photos of the kiss and uses them to blackmail Shōko into a forced friendship. 

Demanding that Shōko play the role of best friend, Eriko seizes control of Shōko’s blog and dictates the terms of their relationship. Powerless, Shōko agrees and Eriko immediately begins planning an overnight trip for them to an onsen in Hakone, convinced this will solidify their bond. The Hakone trip is a miserable failure. Shōko is distant and unresponsive, while Eriko’s attempts to manufacture intimacy only create more tension. After a particularly uncomfortable encounter in the onsen where Eriko swims naked, Shōko fakes period pain to escape a day early, leaving an infuriated Eriko to finish the trip alone. 

The breaking point comes on their way home from a final, tense meeting at Denny’s. While giving Eriko another ride on her bike, Shōko struggles under Eriko’s now-heavier weight, causing them to fall. In the reflection of a dark shop window, Eriko sees herself for the first time in weeks and is horrified by her own disheveled appearance and by the weight she has gained. The shock provides a moment of clarity. Realizing her obsession has destroyed her and that her friendship with Shōko is an illusion, she deletes the blackmail photos, setting Shōko free. 

Liberated, Shōko returns home and immediately confesses her infidelity to Kensuke, who, devastated, asks her to leave. With nowhere else to go, Shōko returns to her family home, only to find it in squalor and her father incapacitated by a stroke. Forced into the role of caregiver, Shōko confronts the bleak reality of her family’s dysfunction and her father’s squandered fortune. Her attempts to reconnect with her new blogger friend, Nori, are sharply rebuffed when she is accused of being an obsessive fan, leading Shōko to a painful epiphany about her own behavior and its similarity to Eriko’s. This newfound self-awareness prompts her to take charge of her life, making arrangements for her father’s care and reaching out to estranged family. 

Eriko, meanwhile, returns to work, where she is demoted and ostracized. After a final, violent confrontation between Maori and Sugishita in the office kitchen, Maori tells Eriko to quit. A subsequent, honest conversation with her mother reveals hard truths about her sheltered upbringing. In the middle of a sleepless night, Eriko discovers Shōko has deleted her blog. She goes for a walk and finds Keiko working the night shift at the local Denny’s. They have a final, cathartic conversation about the nature of friendship and the necessity of moving on. Accepting this, Eriko deletes Shōko’s number from her phone. As dawn breaks, she sits alone in the family restaurant, finally at peace and ready to start a new life.