The drive to the Aichi Chiryu district was a blur of neon lights reflected on wet asphalt. This was Arata's hometown a place that usually felt like a sanctuary, but tonight it felt like a graveyard of secrets. The industrial sector of the district was a maze of rusted shipping containers and warehouses that whispered with the hum of heavy machinery.
"Arata-san, the chemical analysis for that amber shard just finished," Hana said, her face illuminated by the blue light of her tablet. She sat in the passenger seat of their battered office car, her fingers flying across the screen. "It's not just sucrose. It's a specialized industrial grade mixed with a conductive polymer. It's used in high-precision timed igniters for demolition... or for remote-triggering mechanical devices."
Arata gripped the steering wheel. "Mechanical devices like a modified firing pin."
"Exactly," Hana continued, her voice growing more urgent. "But here's the kicker: this specific polymer is only manufactured by a subsidiary of the Hanagawa Group. They have a distribution hub right here in Chiryu."
Arata's jaw tightened. The name Hanagawa wasn't just on the buildings; it was a ghost that haunted the upper echelons of the city's power structure. If the "Red Viper" was protecting someone, he wasn't just protecting a corrupt cop illegally sourced tech from a major conglomerate meant this went all the way to the top.
"We're here," Arata said, pulling the car into the shadows of a derelict loading dock near the pier.
The warehouse was marked Distribution Hub 7. It was a massive, windowless block of concrete that looked like it hadn't seen a legal shipment in years. According to Yatsurugi's old files, this was the heart of the "Shinjuku Bust" investigation before his partner was killed.
"Stay in the car, Hana," Arata commanded, reaching into the glove box for a heavy-duty flashlight.
"No way," she snapped, grabbing her tablet and stepping out into the rain. "If you're going to get yourself killed in a locked room, I'm going to be the one who films the evidence. You need a witness, remember? That's how we won Case #1."
Arata looked at her, seeing the stubborn fire in her eyes, and nodded once. They moved toward a side entrance, the salt air stinging their lungs.
Inside, the warehouse was a cavern of silence. Row after row of wooden crates were stacked twenty feet high. Arata clicked on his light, the beam cutting through the thick dust motes.
"The burnt sugar smell," Arata whispered, sniffing the air. "It's stronger here."
They navigated the labyrinth until they reached a small office elevated above the floor. Inside, the walls were covered in blueprints not of buildings, but of the Metropolitan Police Headquarters. One specific map was pinned to the center: Basement Level 2, Evidence Room 4.
"They didn't just plan a murder," Arata said, his voice cold. "They built a replica. They tested the remote trigger here."
He shone his light on a workbench. Scattered across it were sugar-polymer shards, a high-voltage battery, and a set of schematics for a service weapon the exact model used by Detective Yatsurugi.
"Hana, take photos of everything," Arata said. "The serial numbers, the blueprints, the Hanagawa logos. If we can link this room to the murder weapon, Nosaku's 'generator test' theory falls apart."
"I'm on it," she said, her camera shutter clicking rapidly. "Arata, look at this. There's a logbook here. It's a list of visitors to this facility."
Arata leaned over her shoulder. His heart stopped.
The most recent entry, dated three days before the murder, wasn't a name. It was a signature in dark red ink. A sharp, aggressive scrawl that Arata had seen on a hundred legal motions.
Shin Nosaku.
"He wasn't just anticipating my moves," Arata whispered, the realization hitting him like a physical blow. "He was part of the design. He didn't find the evidence he helped create the crime."
Suddenly, the heavy industrial lights of the warehouse flickered and hummed to life, bathing the room in a blinding, artificial glare.
"I told you, Arata," a voice boomed, echoing off the corrugated metal walls. "Some doors are locked for a reason."
Arata turned. Standing at the far end of the catwalk, his red suit looking like a flame in the darkness, was Shin Nosaku. Behind him stood four men in dark tactical gear, their faces obscured by gas masks. They weren't police. They were private security the kind that didn't bother with arrest warrants.
"You're a long way from the courtroom, Rookie," Nosaku said, walking slowly toward them, his hands in his pockets. "In here, there are no judges. No juries. And certainly no 'Not Guilty' verdicts."
Arata stepped in front of Hana, shielding her. He reached into his pocket and gripped his notebook. "You're an officer of the court, Nosaku. You're a prosecutor. If you do this, you destroy the very system you claim to protect."
Nosaku stopped at the edge of the office, looking down at Arata with a mixture of pity and contempt. "The system isn't the law, Arata. The system is the order. And you are a chaos element. You're trying to fill a notebook with 900 wins? I'm going to make sure you don't even finish the first page of Volume One."
Nosaku raised a hand, and the men in tactical gear stepped forward.
"Hana," Arata whispered, his voice low and dangerous. "Are the photos uploaded to the firm's cloud?"
"Uploaded and encrypted," she replied, her voice shaking but her hands steady.
"Good," Arata said, his eyes locking onto Nosaku's. "Then let's see if the Red Viper can catch someone who knows how to fight in the dark."
Arata grabbed a heavy fire extinguisher from the wall and slammed it against a pressurized valve on a nearby tank. A massive cloud of white chemical fog erupted, swallowing the room in an instant.
"Run!" Arata shouted.