Ryuen Kakeru sat at the desk in his dorm room, staring at the cursor blinking on his computer screen. A USB drive was plugged in, and the thirty-second video of Sudo shoving someone played on repeat. His finger hovered over the mouse. Three clicks were all it would take to send the video anonymously to the Class D group chat—but he didn't click. He'd noticed something. He'd watched this video more than once, including last semester when he handled that dispute. But this time, at the seventeen-second mark, a reflection appeared in the lower-right corner that shouldn't have been there. The figure reflected in the glass window wasn't Sudo or Ishizaki. A blurry silhouette stood outside the Equipment Room, one hand holding a phone, its camera pointed inside.
Ryuen rewound the video to the seventeen-second mark and enlarged it frame by frame. The reflection wore a school uniform skirt, its hem a little shorter than the other girls'. The reflection lasted less than half a second before vanishing in the next frame, but that was enough for him to recognize the skirt. Manabe Shiho. The girl from Class C who'd verbally bullied Sakura Airi had been outside the Equipment Room at the time—and the reason that shoving incident had been recorded by the Disciplinary Committee as a "verbal warning" was that she'd enlarged the footage, blurred the identities, and submitted it to someone as a lead.
Ryuen knew better than anyone who was behind Manabe. Last semester, Kushida Kikyo had borrowed the unedited original footage from him under the pretext of "assisting with a Disciplinary Committee investigation." She'd said she wanted to verify a separate dispute in Class C. He'd been busy dealing with Ishizaki's mess after he'd climbed over a wall, so he'd approved it without a second thought. Looking back now, it hadn't been a loan at all. It had been a backup. From the start, Kushida had held evidence on both sides: the materials Ryuen used to manipulate the Disciplinary Committee and the backup she used to manipulate Ryuen. She'd sold Sudo and Ishizaki's altercation to Manabe, then hidden Manabe's footage in a gap within the Disciplinary Committee's archives. She'd been three steps ahead at every turn.
"You planned from the beginning to make everyone bite each other's tails." Ryuen muttered to himself, shut off the video player, and stood to walk over to the window.
He had two paths ahead of him. The first: release the video as planned, blow up Sudo's standing, and throw Class D into disarray. But Kushida had Manabe's full, unedited footage. If the video went public, she could immediately produce the complete recording. Then whoever had first set off the Class D group chat would be accused of deliberately concealing the truth and attempting to frame someone. Every record he'd falsified with forged evidence would come tumbling down like a row of dominoes. Everything was on the Disciplinary Committee's server. Kushida didn't need to lift a finger. She only had to wait for him to press send. The second path was more dangerous: admit Kushida had outplayed him, hold off on releasing the video, but keep up the appearance of an offensive while investigating Manabe, Ishizaki, and every connection to those old files. If he could find something to counter Kushida before she closed her net, he'd still have a chance to turn things around.
His phone lit up with an unread message from Kushida Kikyo. There was no text, just a photo: a selfie of Karuizawa Kei holding a signal jammer in a karaoke booth, with the edge of a white school uniform skirt visible in the corner. Karuizawa hadn't gone tonight, but he'd already received this photo she'd taken in advance. Kushida was hinting at two things: Karuizawa had a jammer, and she wasn't as simple as she seemed. The very existence of the photo reminded him that if he tried to betray Kushida, she could turn her sights on him at any time.
"Then I won't send it." Ryuen pulled out the USB drive and tossed it into a drawer, shutting it with enough force to shake the whole desk. But soon he opened the drawer again, retrieved the drive, and plugged it into a second device: an old, completely offline tablet he used specifically to store sensitive materials he'd handled for the Disciplinary Committee. He opened another folder and began tracing all the information Kondo had passed to him since the start of the school year. If there was some past connection between Kushida and Kanzaki that he didn't yet know about, that was the biggest unknown right now.
At the same time, in Karuizawa Kei's room in the Class D girls' dormitory, only a desk lamp was on. Its orange light pooled over one corner of the desk. The steam had long since faded from her canned red bean soup. The can had gone cold in the chill, beaded with a fine ring of condensation. She pushed the unfinished soup half an inch away and focused on her phone. Every few seconds, the blinking indicator on the signal jammer lit up and went dark, casting a tiny green dot on the dim bed curtain.
Kushida hadn't come tonight, but the photo she'd sent revealed two things: she knew Karuizawa had brought a jammer, and she was using her absence to send a message. There was only one person in the class who communicated through silence like that. Kushida Kikyo. But Karuizawa Kei wasn't about to walk onto anyone else's chessboard. She turned the jammer over to confirm that the encrypted chip on the underside was still working properly, then sent an encrypted text to Kanzaki Toru: "Kushida stayed away tonight, but sent a photo of me with the jammer. She deliberately gave me reason to be wary of her. I'm not putting the jammer away—I'll leave it on and let her see. But now it's time to let her know this isn't the only one."
A moment later, her fingers swept across the screen. She pulled up more than a dozen photos she'd taken that afternoon from her encrypted album. They were arranged by date, each with a clearly marked timestamp: changes to the rooftop door lock at the Old School Building, a notice about shoeprint detection in the Logistics Passage, and photos Sakura had taken of Kushida repeatedly changing shoes while she kept watch by the shoe lockers. Karuizawa imported all the photos into a newly created folder, set a password, and compressed them into a private background backup task she'd set up. Then she turned off the light, got into bed, set the jammer beside her pillow, and closed her eyes. The room was quiet except for the faint rush of air from the air conditioner.
Shiina Hiyori wasn't asleep yet. She sat in a small staff room in the Library after closing time, three monitors lined up in front of her. The left screen showed scans of Old System files, the middle showed a timeline topology chart of Ryuen's forged evidence, and the right traced every instance of Kushida's "kind assistance" since the start of the school year: bringing cookies, volunteering to run errands for the Disciplinary Committee, submitting materials on behalf of classmates, and telling everyone in the hallways, "It's okay, I'll take care of it." None of it seemed suspicious on its own, but together it formed a precise road map. Every instance of "kind assistance" happened just before or after a key information node.
She marked Kushida's behavioral timeline in blue and the known information leaks with red Xs. The two sets of markers aligned with astonishing precision: within forty-eight hours before every information leak, there was always one instance of "kind assistance" on Kushida's timeline. She encrypted the analysis chart and sent it to Kanzaki Toru, adding a note: "She isn't collecting information. She's building a trust network. Every piece of candy, every cup of coffee is a cached file in the back end of an access-control system."
Then she turned off the monitors, leaving only the middle one on. Its cold light reflected off her expressionless face, and her pale brown eyes narrowed almost imperceptibly. She scrolled to a connection in the lower-right corner of the topology chart for Ryuen's forged evidence. Ishizaki's note had been catalogued alongside the Old System files, and the Disciplinary Committee's automatic filing system for regular meetings now displayed an index number. Layers of filing cabinets, scraps of paper, and borrowing records stood between her and Ishizaki. They seemed like two people who would never speak, yet at that moment, they were gently connected by the same timestamp in the server log.
After receiving all the data packets from Kanzaki Toru, Shiina, and Karuizawa, Horikita Suzune spent less than an hour organizing everything into a complete preliminary Disciplinary Committee hearing dossier. She saved it to her tablet but didn't submit it. Meanwhile, Sakagami-sensei had used his retired-teacher privileges to retrieve the master-control records for the Logistics Passage between the Mail Room and the machine room. They matched the time window Kanzaki Toru had predicted exactly. Horikita picked up the last attachment: the photo Sakura had taken on the rooftop. There was no flash in the photo. Only a small patch of cold light from the machine room's fluorescent lamp, leaking through a ventilation window and perfectly framing someone's profile.
She set the photo beside all the other supporting evidence in the encrypted partition, closed the cover, and took her third cup of black coffee that day over to the window. The security lights atop the high wall swept slowly across the empty sports field at dawn. Their beams cut across the glass. The coffee had gone cold long ago; the only reason she drank it was to stay alert enough to maintain the last line of defense before sunrise. She watched for a moment in the direction of the gravel path beneath the moonlight, then suddenly thought of a question no one had raised before: when Chabashira-sensei had first warned Sudo in the hallway not to add any more injuries to his face, who had told her that Sudo's old injuries came from off campus? She didn't write the thought in her tablet. Instead, she spread out the diagram again and drew a tiny question mark in very fine pencil at the crossroads of all the relationships.
It was 3:40 a.m. Kanzaki Toru was still at his dorm desk. The curtains were tightly drawn, the monitor's cold light reflected on his face, and the whole room was swallowed by darkness. The Illustrated Guide's spine listed those names in order. Karuizawa's Perception Resonance pulsed at a low frequency, Shiina's Silent Archive put all the files in order, and Sakura's Trust Eye was still catching new signals from the flicker of lights on the rooftop. Everything was running, and he sat at the intersection of every branch, checking the encrypted packets from Karuizawa, Shiina, and Horikita one by one.
The White Room had taught him that the most dangerous opponent wasn't the most ruthless one, but the one who left you unsure whether she was your opponent at all. Kushida hadn't gone to karaoke tonight, hadn't shown up in the machine room, and hadn't made a move. She'd only left behind a few pictures, a pair of shoes, a bowl of unfinished red bean soup, an unsigned blank envelope, and a USB drive containing part of Manabe's footage, returned to the depths of Ryuen's drawer. Then she'd quietly made her exit, leaving everyone with a question they couldn't help asking themselves: had she outsmarted them, or had they walked into her trap of their own accord?
Two hours later, morning light rose above the gray wall. All the clues from that night quietly fell into place. No one sent the video meant to set things off, and no one submitted the seemingly irrefutable preliminary hearing dossier. But everyone knew the first rays of sunlight hadn't come to announce the arrival of dawn. They had come to reveal the last card deliberately kept hidden that night.
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