The call came on a Friday evening in early autumn, when Izumi City's narrow residential lanes turned the color of tarnished brass under the setting sun. Sakura Aoki stood at her kitchen counter, sorting through mail she had ignored for days, when her phone rattled against the ceramic tiles. The screen displayed an unfamiliar number with a local area code. She almost declined it — telemarketers had grown relentless that month — but her thumb hesitated over the red button, suspended by an instinct she would later recognize as the first tremor of a coming earthquake.
"Aoki Sakura-san? This is Detective Kitamura, Izumi East Criminal Investigation Unit. Am I speaking with the sister of Aoki Miyu?"
Sakura's hand tightened around the edge of the counter. The detective's voice carried the rehearsed neutrality of someone who had delivered too many devastating sentences to count. She listened as he explained that her younger sister had been discovered unresponsive in her apartment in the Shiohama district, that the building manager had grown concerned after two days of uncollected packages, that officers had forced entry after obtaining the landlord's permission. The word "unresponsive" hung in the air between them, a euphemism so thin she could see right through it.
"Unresponsive," Sakura repeated, as if testing the word might change its meaning. "What does that mean exactly?"
"We would appreciate it if you could come to the scene," Kitamura said, sidestepping the question with practiced ease. "There are matters requiring formal identification. I understand this is difficult, but your cooperation would greatly assist our preliminary investigation."
She took the express train from Kitayama Station, sitting rigidly in a corner seat with her work bag clutched against her chest. The carriage hummed with ordinary life — a teenager scrolling through social media, an elderly woman knitting something pale blue, a salaryman dozing with his mouth slightly open. The normalcy of it felt obscene, as if the world should have stopped spinning the moment her sister's heart did.
Miyu was twenty-three, seven years younger than Sakura, though people often mistook them for twins. They shared the same narrow face, the same habit of tilting their heads when confused, the same crooked left incisor that their mother had insisted was a sign of good fortune. Miyu had moved into the Shiohama apartment six months ago, a cramped one-room flat above a calligraphy supply shop, chosen specifically for its northern light. She made her living selling small ink paintings at weekend markets and taking occasional commissions for magazine illustrations. She had been, by all accounts, happy.
The Shiohama district revealed itself through the train window as a patchwork of aging apartment blocks, independent galleries, and narrow streets lined with vending machines that glowed like altars in the dusk. When Sakura emerged from the station, she found the address easily enough — a four-story concrete building with rust stains weeping from its balcony rails, its entrance cordoned with yellow police tape that lifted and fell in the autumn wind.
Detective Kitamura met her at the third-floor landing. He was shorter than she had imagined, with a carefully maintained side part that exposed too much scalp and eyes that seemed to have seen everything and retained nothing. He bowed with mechanical precision and launched into his procedural script before she could ask a single question.
"The door was locked when officers arrived. The cylinder showed distinct scoring consistent with a rake-and-tension tool — not the work of a professional locksmith, but someone with sufficient practice. The interior showed signs of struggle in the main living area. We are treating this as an unlawful entry that escalated into a tragic outcome."
"Tragic outcome," Sakura said. "You still haven't told me what happened to my sister."
The detective's gaze flickered toward a younger officer standing nearby, a wordless exchange that told Sakura everything she needed to know about how the police intended to handle this case. "We can arrange for identification through photographs at the station. Given the circumstances, I would advise against — "
She was already past him, her shoulder brushing against the doorframe, her vision contracting to a narrow tunnel. The genkan was undisturbed. Miyu's shoes sat neatly aligned against the wall, two pairs of canvas sneakers and one set of indoor slippers with faded floral patterns. The main room beyond opened into a space of perhaps twelve tatami mats, sparsely furnished with a low kotatsu table, a pine bookshelf crammed with art manuals, and a wall-mounted drawing board. The window faced west, and the last of the sunlight pooled across the floorboards in a rectangle of molten amber.
A folding screen stood partially opened in the center of the room, its paper panels decorated with a traditional landscape of mountains and mist. It belonged to their grandmother, Sakura realized — she remembered it from childhood summers, the way the paper had yellowed with age, the faint watermark of a crane in the bottom corner. It did not belong in Miyu's apartment. Someone had placed it there deliberately.
Beyond the screen, Sakura saw what remained of her sister.
She did not scream. Her throat sealed itself shut, a fist of silence that would not loosen for hours. She stood motionless, cataloguing details with the cold precision of a camera lens — the dark color dried into the tatami fibers, the angle of Miyu's arm with fingers curled inward as if clutching an invisible brush, the fishing line strung from the ceiling hook where a paper lantern should have hung. Suspended from that line, positioned precisely at eye level, was a canvas.
The painting measured perhaps thirty by forty centimeters, small enough to be intimate, large enough to be unmistakable. Crimson and black spiraled inward from the edges, layer upon layer of pigment that had been applied not with brushes but with something more direct — fingers, perhaps, or palms. At the center, a void opened like a dilated pupil or a mouth frozen mid-scream. The surface still glistened wet in places, catching the dying light in ways that made Sakura's stomach turn. In the lower right corner, scratched through the pigment with what might have been a fingernail or a brush handle, was a single character: 零 — Zero.
"Aoki-san, please step back." A young female officer appeared at her elbow, her hand hovering near Sakura's arm without quite touching. "The forensic team needs to process the scene. You shouldn't be here."
Sakura allowed herself to be guided toward the doorway, but not before she pulled out her phone and took two photographs. The first captured the canvas in relation to the ceiling hook and the folding screen. The second zoomed in on the Zero mark until the character filled the frame, its edges rough and trembling. The female officer made a soft sound of protest but did not intervene.
In the hallway, Detective Kitamura offered her a paper cup of vending-machine coffee. She accepted it without drinking, the warmth seeping into her palms while the rest of her body remained cold. "The painting," she said, her voice emerging as a rasp. "Who painted it?"
"We believe it was already present in the apartment. Possibly the victim's own work. The canvas was likely displaced during the struggle and became entangled in the ceiling fixture."
"That isn't my sister's work. I've seen everything she painted. Her style, her colors, her signatures — this is none of those things. This was made by whoever killed her."
The detective jotted something in his notebook, a gesture so small and final that it told Sakura exactly how much weight her words carried. "We will note your input. However, I must urge you to let us conduct the investigation according to procedure. Home invasions are distressingly common in this district. The most likely explanation remains theft interrupted."
"Then where is the stolen property?" Sakura's voice rose, drawing glances from the officers milling in the corridor. "Her laptop is still on the desk. Her wallet is in her bag. What thief breaks in, kills someone, hangs a painting over the body, and leaves without taking anything?"
Kitamura closed his notebook with a soft snap. "Aoki-san, I understand you are grieving. Grief can make us see patterns that are not there. We will contact you with any developments."
She did not go home. She waited outside the apartment building until the forensic team arrived in their white van, watched them carry aluminum cases and tripod lights up the narrow staircase. When they brought Miyu out on a stretcher, covered in a plain white sheet, Sakura stood with her back pressed against a concrete pillar and counted her breaths until the ambulance doors closed and the vehicle pulled away into the darkening street.
She walked to an all-night internet café in the next district over, paying for a private booth with a sliding door and a worn vinyl chair. The monitor cast blue light across her face as she logged into Miyu's cloud account — they had exchanged passwords years ago, after their mother died, a pact made in the trembling aftermath of loss. Miyu's files were organized with characteristic precision: folders for commissions, for personal work, for reference images sorted by subject. But one folder had been created only two weeks prior, labeled with a single character: 零.
Inside, Sakura found screenshots of comments on Miyu's social media posts, all from an account with no profile picture and a username consisting of a long string of numbers. The comments were brief, cryptic, and increasingly frequent over the past month: "Your lines are growing sharper." "The doorway opens inward." "Soon you will be ready." The last one had been posted three days before Miyu's body was found: "The canvas waits for its final stroke."
Sakura copied everything onto a flash drive, then opened Miyu's most recent photo album. The images showed her sister at gallery openings and studio gatherings, surrounded by faces Sakura did not recognize. One photograph caught her attention — Miyu standing next to a man in a dark coat, his face partially obscured by the angle, his hand resting on her shoulder with an intimacy that suggested more than casual acquaintance. The background showed a flyer for an exhibition at a space called "Void Gallery."
She searched for Void Gallery and found a website that looked abandoned, its landing page showing nothing but a black screen with a single input field that prompted for a password. The page source revealed no clues — just a tangle of obfuscated code and a server address that traced back to a hosting company in a jurisdiction with no data-sharing agreements. Whatever Void was, it had been built to resist casual investigation.
Sakura drafted an email to a journalist named Haruki, a man she had met two years ago during a brief freelance assignment covering an underground music festival. He had given her his card with the casual assurance that she should call if she ever "found something strange." She had never taken him up on the offer until now. The email was short: "My sister is dead. Someone left a painting signed 'Zero' at the scene. The police won't listen. I need help."
Before she could send it, a notification appeared on her personal email. The sender was the same string of numbers from Miyu's comment section. The subject line was blank. The body contained three lines:
"Your sister was beautiful in her final moment. She became something greater than herself. Do not look for Zero. Zero will find you."
Sakura stared at the screen until the words dissolved into pixels, her breath coming in shallow bursts. Then she saved the email, sent the message to Haruki, and began constructing a timeline of her sister's final week. She worked until the café attendant announced closing time, until her eyes burned and her fingers cramped, until the sky outside the window shifted from black to gray to pale, watery gold.
The police had their procedures, their forms, their statistical likelihoods. Sakura had something else — a name scrawled in drying pigment, a folder marked with nothingness, and the cold, clarifying knowledge that her sister's killer was still out there, watching, waiting, painting.
She would find him. Whatever it cost. Whatever she had to become.
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