The feel of the bookmark still lingered on his fingertips. Two days had passed since then. The streetlight's glow bleeding into the concrete on the way home, his mother's handwriting scrawled on a refrigerator note, the thin washi paper deep in his pocket——everything was still moving inside Tanaka Kenji. A passage from Miyazawa Kenji left behind by someone in the library. He still had no answer to who wrote it. After school on Tuesday, the sky hung low and heavy. The rainy season had been officially declared in yesterday morning's news. The humid wind blowing in from Shionagi Bay clung to his uniform shirt against his skin. While students with umbrellas filed out through the front entrance, Kenji slipped out through the back door. Walking against the flow of people——it was a habit he'd picked up over three years. Shionagi Municipal Nagisa Library——a two-story building ten minutes' walk from the east exit of the station, standing at the north end of the coastal road——grew even quieter on rainy days. The white exterior of the 1991 structure looked grayish-white beneath today's overcast sky. The mixed scent of salt and old paper drifted out as the automatic doors opened. Kenji drew that smell into his lungs and exhaled slowly. At the counter, Katagiri Hiroko——a thirty-four-year-old librarian who'd been here since Kenji started coming——was processing new book registrations. Eyes on the computer screen, she ran the barcode reader across the spines. Beep, beep, the sounds continued in steady rhythm. When Katagiri noticed Kenji enter, she gestured toward the back with her chin without looking away from the screen. "The return carts are already piling up. Three of them," "Got it," No further words were needed between them. Kenji put on an apron and took one of the carts. He found this wordless understanding comforting. If being transparent at school was a defensive mechanism, then silence in the library was the product of contentment——the same quietness, but entirely different in nature. Pushing the cart, he walked between the shelves on the first floor. Ra section, Wa section, then social sciences. He checked each spine and slid the books into their proper places. His body remembered three years of repetition; his hands moved without his mind having to engage. Outside the window, the rain intensified. The sound of it striking the glass echoed softly between the shelves. (Who could it be?) The bookmark surfaced in his thoughts again. He tried to push it down, but couldn't. Normally, he'd quickly file away any question without a name and seal the box shut. But this time it didn't work. The weight of that thin washi paper had penetrated deeper than he'd expected. As he passed the Ka section, Kenji confirmed the passage to the local history room on his right. He was about to turn the corner when—— He collided with something. More precisely, something flew into him. A dripping umbrella, wet shoes, a body moving with momentum. Several books fell from Kenji's arms, scattering across the floor. Soft thuds echoed——pasa, pasa. In three years at this library, he'd never bumped into anyone. "I'm so sorry!" The voice was just slightly too loud for the library's silence. It came out in a burst, and she seemed to notice, quickly lowering her volume. "Oh... sorry, my voice," she added softly. Kenji knelt to pick up the books. In his field of vision, a face suddenly appeared at close range. Bright chestnut-colored hair fell to her shoulders, slightly damp from the rain. An asymmetrical bob, tilted forward, occupied about half his visual field. Large green eyes looked straight at him. Dimples appeared alongside her smile. "I'm really sorry. I was in a hurry and wasn't looking where I was going," Kenji's observational instincts activated without conscious thought. The asymmetry of her mouth corners——the right side slightly higher. When smiling, the orbicularis oculi muscle contracted about 0.2 seconds behind the overall facial movement. The tone of her voice and the landing point of her gaze were subtly misaligned. Her eyes were fixed on his face, but the focus wavered for just an instant before settling. (It's constructed.) Classification completed in under a second. This was a meticulously built smile. The material was genuine emotion——the apology was real——but the form in which that emotion was expressed was far too perfected. Like a movement repeated countless times. Kenji picked up the books and let it pass without comment. "Don't worry about it," "But the books——are they okay? Not wet?" The girl knelt beside him on the floor and began checking the scattered books. Water droplets fell from her umbrella's tip, creating small stains on the floor. Kenji silently examined the covers——none were wet. If library books got soaked, it would be a hassle. That was his reflexive thought. "They're fine," "Thank goodness," As she stood, the girl handed him one of the books. Kenji accepted it and returned it to the cart. In that sequence of movements, her fingertips grazed the back of his hand. For just a moment, his skin's sensitivity sharpened. (What was that?) Not surprise. But something——a faint sound deep in his chest. A sound he couldn't name. Kenji tried to classify it and failed. "I'm Yamamoto Akira. I just transferred into class 3-2," Class 3-2——Kenji repeated internally. His class. But he hadn't noticed a transfer student arriving yesterday. It showed how inward-focused his classroom observations were. "Tanaka Kenji. Same class," "Really?" The girl's expression shifted. It moved differently than her earlier smile——the outer frame of her constructed smile couldn't quite keep up with genuine surprise for just an instant. A 0.3-second glimpse of her unguarded face. Kenji observed it precisely. (Interesting.) The word "interesting" surfaced, and Kenji felt a slight confusion at it. When observing people, he usually felt the satisfaction of calm classification. "Interesting" was a different kind of reaction. 　　　＊ The rain grew even heavier. Outside the window was gray, and the streetlights on the coastal road were already lit. It wasn't even five o'clock yet, but the sky was darker than evening. The library's fluorescent lights cast uniform white light between the shelves. Akira——Yamamoto Akira——sat beside Kenji at the window-side counter. She'd told Katagiri she'd wait out the rain while returning books, and Katagiri had said "please do." That was all it took for them to end up sitting side by side. Akira pulled a paperback from her bag. After checking the cover, she turned it slightly toward Kenji. "Do you read a lot too? Doesn't this library have a pretty good selection?" "Pretty decent," "Pretty decent?" She laughed softly. This time her constructed smile and genuine smile overlapped properly. Kenji observed and confirmed the overlap. "First time coming here?" "First time at this library. But I go to libraries a lot. I've made it a habit to find the library first whenever I transfer. This is my fourth time since middle school," As she said "whenever I transfer," Kenji caught a slight shift in her voice. Fine noise mixed into the frequency of her cheerfulness. A change lasting less than a second, with no change in volume or expression. But Kenji heard it. The outer frame of that meticulous smile trembled faintly from within. (Four times.) Kenji didn't respond. Silence flowed between them. Rain continued striking the window. Then he noticed something. His silence wasn't pressuring her. Normally, in such moments, people feel awkward. They try to keep talking, look away, or check their phones. But Akira simply existed quietly in his silence. Her body leaned slightly toward him——a few centimeters more than before. A movement that couldn't have been conscious. (What is this?) The phrase "wordless gravity" surfaced in his mind and faded. He felt a faint bewilderment at such poetic language appearing in his thoughts. Then, deep in his chest, something quietly but distinctly quickened. Not surprise. Not fear. His body's response to sensing someone's presence——the body heat of someone in this space——nearby. He couldn't yet name what it was. But he could judge that it was a type of reaction he'd never experienced before. Akira looked out the window. "The rain's really intense," "Yeah," It was an ordinary exchange. But the fact that an ordinary conversation had proceeded ordinarily struck Kenji as slightly strange. The sensation of answering someone with "yeah" for the first time in about three years. "——So why do you volunteer anyway? For your school record?" There was a slightly mischievous edge to the question. Not testing him, just genuinely curious, Kenji could tell. "I like it," "The library?" "The quiet," Akira fell silent for a moment. Then she spoke, her voice lower than before. "...I think I understand," The weight of those words reached him. The word "understand" came not from light sympathy but from something concrete——an experience that seeped through the bottom of her voice. Four transfers. The habit of finding the library first. The meticulously constructed smile. ——They were beginning to take on vague outlines. (Maybe this person is also moving while running from something.) It wasn't certainty. There was no basis for it. Just the sum total of observation disguised as intuition telling him so. Then——Akira's phone vibrated briefly in her bag. Her shoulders tensed slightly. A moment of hesitation before looking at the screen. The outer frame of her smile trembled from within again. "Sorry, just a moment...," She took out her phone and checked the screen. Her expression didn't change——or rather, she was keeping it from changing, Kenji's observation told him. Akira stood up. "I should get going. I'll come back to this library again," "Yeah," Akira picked up her umbrella, slung her bag over her shoulder, and turned to face him. One last time, she formed that dimpled smile. This time it was flawless. As if the way she'd lowered her voice by the window had never happened. The automatic door opened, the rain sounds grew louder, and it closed. 　　　＊ Kenji resumed pushing the cart. His body moved by habit. Check each spine, slide the books into place. Ra section, Wa section, history. But something inside had shifted. Like the subtle ripple of water when you tilt a full cup. That 0.3-second gap when her smile vanished replayed repeatedly in his mind. In three years of observation——classifying countless faces in classrooms, hallways, the library——he'd never seen anyone whose smile's outer shell and interior diverged so clearly. The more perfected the smile's form, the more stark the divergence. The more meticulous, the more the cracks cut into his vision. As he organized the shelves, Kenji quietly came to understand. Becoming invisible so no one could see you. Wearing a smile so everyone could see you. ——Opposite directions. But both were "an exterior to protect the interior." Both functioned as defense against something. The same defense mechanism in different forms. (It's the same structure as me.) That realization fell quietly but certainly into the center of his chest. Ripples spread like waves, slowly expanding. Too vague to call emotion, but something was definitely trembling. Katagiri operated the copy machine in the distance. A low hum——gooooon——dissolved into the library's silence. Kenji returned the last book to the shelf and pulled the cart toward him. In his pocket was the bookmark. He confirmed the thin washi paper's texture with his fingertips. The possibility that the hand that wrote that bookmark——the hand that copied Miyazawa Kenji in fountain pen——might be the same hand that so meticulously constructed that smile floated quietly in his mind as baseless intuition. After closing, when he stepped out onto the coastal road, the rain was still falling. Streetlight glow