Takahashi walks into Denny's, recognizes Mari Asai, and the two catch up over food and conversation.

Kaoru arrives at Denny's and asks Mari to help translate for an injured Chinese-speaking woman.

Mari meets Guo Dongli, a Chinese sex worker badly beaten by her client, and translates her story to Kaoru.

A Chinese gangster on a black motorcycle arrives for Guo; Kaoru boldly demands payment for the client's room.

Kaoru takes Mari to a nearby bar where they trade stories from their pasts over drinks.

Kaoru uses Alphaville's security footage to identify Guo's attacker as an ordinary-looking office worker.

Kaoru calls Guo's contact and hands the returning gangster a clear printed photo of the attacker.

Shirakawa works late at Veritech while his wife calls asking him to bring milk home on the way.

Takahashi visits Mari at the Skylark on a band-practice break and tells her he plans to quit music for law.

Eri wakes inside the television room, unable to open any door or window, and begins to panic.

Mari and Takahashi walk to a nearby park and feed stray cats while talking about Eri.

Mari tells Takahashi she believes Eri does not want to wake up.

Shirakawa stuffs Guo's stolen belongings into a garbage bag and leaves her cell phone in a 7-Eleven dairy case.

Takahashi picks up Guo's ringing cell phone at 7-Eleven and receives a threatening message clearly meant for someone else.

Mari gets into bed with sleeping Eri, whispers for her to come back, and Eri's lips twitch at dawn.

Mari Asai spends a long night in Tokyo's entertainment district, where a chance meeting with Takahashi draws her into the world of nighttime Tokyo. She is recruited by love hotel manager Kaoru to translate for Guo Dongli, a beaten Chinese sex worker, discovering in herself an unexpected capacity for compassion and connection. Kaoru tracks down the attacker through security footage and passes his photo to a Chinese gangster seeking revenge on Guo's behalf. Meanwhile, the violent salaryman Shirakawa finishes his night's work and disposes of his victim's belongings with chilling calm, unwittingly leaving a thread that will link him to Takahashi. Through conversations at the park and elsewhere, Mari confronts the estranged relationship she has with her sleeping sister Eri. The night ends with Mari climbing into bed with Eri at dawn, whispering for her to return — and Eri's lips twitch for the first time in weeks.

The core events of Mari's night in Tokyo.

The narrator's camera surveys nighttime Tokyo from above, describing the city as a single breathing collective organism.

Takahashi tells Mari a Hawaiian myth about three brothers ordered to push boulders up a mountain as punishment.

Eri Asai lies in an unnaturally deep sleep as her unplugged television switches on at exactly midnight.

A shadowy man seated alone in a chair gradually becomes visible on the television screen in Eri's room.

Kaoru introduces Mari to Alphaville employees Korogi and Komugi inside room 404 of the love hotel.

Kaoru and Mari discuss the Jean-Luc Godard film Alphaville and how its themes of loveless sex suit a love hotel.

Kaoru reveals she was once a popular professional wrestler who was forced to retire after badly injuring her back.

Takahashi tells Mari how witnessing criminal trials revealed the terrifying collective force that governs everyone equally.

Takahashi tells Mari he once had a long personal conversation with Eri, who seemed unable to truly listen.

Shirakawa takes a late-night exercise break at Veritech, listening to Scarlatti and inspecting his aching right hand.

Mari and Korogi sit together in an Alphaville guest room watching a late-night documentary about deep-sea creatures.

Korogi confides that she is hiding from dangerous pursuers and shows Mari a burn scar branded onto her back.

Mari tells Korogi the truth about Eri's unexplained sleep that began two months ago and has not ended.

Eri is found back in her own bedroom on the real side of the television screen, her ordeal in the alternate realm over.

As dawn breaks, the narrator's camera rises high above Tokyo and observes the city waking up to a new day.

After Dark opens with a bird's-eye view of Tokyo as one vast collective organism, before settling on Eri Asai sleeping in an unnatural coma as her unplugged television flickers on. Mari's night unfolds against a backdrop of eccentric conversations, from Takahashi's philosophical myth-telling at Denny's to Kaoru's account of her wrestling career cut short by injury. The salaryman Shirakawa is glimpsed in his Veritech office maintaining a chilling late-night routine, exercising while Scarlatti plays and inspecting the hand he used to beat Guo. In a love hotel guest room, Mari listens to Korogi's hidden history and shares the truth about Eri's mysterious sleep for the first time with anyone outside her family. Korogi's insistence on the power of memory gives Mari the emotional key she needs to reconnect with her sister. The story closes as dawn breaks over Tokyo, Eri returns silently to her bedroom, and the city's collective life resumes around those who spent the night in its shadows.

The subplots and supporting moments behind the main story.

Takahashi tells Mari he remembers their earlier double date because he found her cute and her food order unusual.

Takahashi tells Mari she is much easier to talk to than Eri, gives her his number, and promises to return.

The man on the television screen is revealed to be wearing a tight mask that completely hides his features.

Mari's reflection remains in the Skylark bathroom mirror after she walks out, looking around from the other side.

Kaoru presses redial on the Alphaville phone and tells Guo's contact she has a photograph of the attacker.

Takahashi examines the same brand of low-fat milk at 7-Eleven that Shirakawa's wife has just asked Shirakawa to buy.

The Chinese gangster on a black motorcycle drives past Mari and Takahashi without any of them noticing the connection.

Eri finds a pencil stamped with the word VERITECH on the floor while desperately trying to understand where she is.

Takahashi reveals that Eri confided she wishes she and Mari were closer, leaving Mari visibly shaken.

Shirakawa's reflection lingers motionless in his darkened office bathroom mirror after he leaves, then touches its own face.

Takahashi tells Mari about his mother's death from cancer and his father's imprisonment, explaining his lasting feeling of being an orphan.

Korogi urges Mari to hold onto every memory she has of Eri, saying memories are what keep a person alive.

Takahashi asks Mari on a date; she says she is leaving for Beijing soon but does not turn him down.

Mari tells Takahashi about the time she and Eri were trapped in an elevator as children — the moment she felt closest to her sister.

Takahashi promises to write Mari a long letter while she is abroad, and she boards her train as he watches it leave.

The novel's key turning points thread through Mari's encounters across one strange night, beginning with Takahashi's surprising candor about finding Mari more interesting than her beautiful sister Eri. Supernatural moments accumulate around the edges of the story — a masked watcher stares through a television screen at Eri, and the reflections of both Mari and Shirakawa linger in mirrors long after they have walked away. Hidden connections between characters emerge through synchronicity: Takahashi examines the exact brand of milk Shirakawa's wife requested, and a gangster glides past two people he is unknowingly linked to. The emotional turning point comes when Takahashi reveals that Eri secretly wished to be closer with Mari, shattering Mari's assumption that the distance between them was entirely one-sided. Korogi's advice about holding onto memories helps Mari locate a single pivotal moment of closeness from her childhood with Eri. The night closes with Takahashi asking Mari on a date and Mari finally telling him about the elevator — the last time the two sisters truly held on to each other.