The One He Forgot to Mention

Osamu Miya didn’t forget things easily. He ran a busy onigiri shop, kept track of inventory in his head, knew every regular’s favorite filling, and could rattle off expiration dates without checking the fridge. So when he walked into his apartment that evening and heard two voices from the living room—one sharp and accusing, the other calm but clipped—he didn’t feel surprise. He felt a deep, sinking, absolutely mortified realization.

Oh no. I forgot.

He forgot to tell his girlfriend Rina that his twin sister Atsumi was crashing at his place for a week.

The voices got clearer as he kicked off his shoes.

“—tell me who you are. I’ve been calling Osamu all afternoon and he won’t answer, and now you’re here in his apartment, wearing his hoodie?” Rina’s voice wobbled somewhere between hurt and anger.

“I already told you,” Atsumi said, smooth and unhurried. “I’m family. Relax. He’ll be home soon.”

“Family? What kind? A cousin? A ‘friend’?” You could hear the air quotes.

Osamu winced. He could picture it perfectly: Rina, small and fierce, arms crossed, dark eyes blazing. Atsumi lounging on the couch with that unbothered smirk, probably flipping her ponytail like she had all the time in the world.

He hurried down the hall and rounded the corner. Both women turned.

Rina’s face cycled through relief, confusion, then full-on accusation. “Osamu. Explain. Now.”

Atsumi raised an eyebrow. “Brother dear. You’re late.”

“I know.” He rubbed the back of his neck—old habit. “Rina, listen. This is—she’s my twin sister. Atsumi.”

Silence.

Rina blinked. Once. Twice. Her mouth opened, then shut. Color drained from her face, then rushed back in a deep, embarrassed red. “Your… twin sister?”

“The one and only,” Atsumi said, rising from the couch. She was tall, like Osamu, same sharp jaw and light brown eyes, but her hair was longer, softer, and she moved with that fluid confidence he’d always envied. She stuck out a hand. “Atsumi Miya. Nice to meet you. I’ve heard a lot—Osamu doesn’t shut up about his pretty girlfriend.”

Rina shook her hand mechanically, eyes darting between the twins, cataloging the identical noses, the same slight head tilt. “Oh my god,” she whispered. “I thought you were—I thought he was cheating on me with some mysterious woman—and you’re his sister.”

“Identical twin sister. Well, fraternal. Same birthday, same stubborn gene.” Atsumi’s smile was warm, disarming. “I promise, not here to steal your man. Just need a place while I look for an apartment in Miyagi. Osamu offered his couch.”

Osamu winced again. “I meant to tell you. Really. But the shop’s been crazy, and you had that late shift, and I thought I’d mention it when we talked, but we got distracted by the thing with your mom’s cat—”

“You forgot.” Rina’s voice was flat, but her eyes were already softening.

“I forgot,” he admitted miserably.

Nobody moved for a long second. Then Atsumi let out a laugh—bright, unguarded, the kind that makes you want to join in. “Honestly, this is the most entertaining thing that’s happened to me all week. I show up, your girlfriend walks in, and suddenly I’m the other woman. Osamu, you really need to work on your communication skills.”

“I know,” he groaned.

Rina covered her face with both hands, shoulders shaking. For a second Osamu thought she was crying, but then a muffled giggle escaped. “I can’t believe I accused your sister of being your mistress. I’m so sorry, Atsumi. I’m usually not this crazy. I just—work’s been stressful, and you weren’t answering, and I saw her in your hoodie and I just assumed—”

“Hey.” Atsumi stepped forward and gently pulled Rina’s hands away. “Don’t apologize. If I were in your shoes, I’d have done the same. Probably worse. I would’ve thrown a shoe at him.”

“I would’ve thrown the whole rack,” Rina said, sniffling.

“See? We’re gonna get along great.”

Osamu watched the tension drain out of the room like water from a cracked sink. His shoulders finally relaxed. He’d seen Atsumi do this before—she had a way of defusing explosions before they detonated. Same skill she used as a sports journalist, turning defensive athletes into open books.

“I’m really sorry,” Rina said again, turning to face him properly. Her cheeks were pink, but the fire was gone. “I should have trusted you.”

“You had every right to be suspicious,” Osamu said, crossing to stand beside her. He slipped an arm around her waist, and she leaned into him—peace offering accepted. “I messed up. I’ll set a reminder next time. Ten reminders. I’ll tattoo it on my hand.”

“Please don’t,” Atsumi said. “You have terrible handwriting.”

Rina laughed, light and genuine. “You’re really his sister, huh? Same sense of humor.”

“More like the same inability to shut up,” Osamu muttered.

Atsumi stuck her tongue out at him, and for a moment they were fourteen again, bickering over the last piece of shrimp tempura. Some things never changed.

“Alright,” Atsumi said, clapping her hands. “Crisis averted. I’m starving. You two want dinner? I was gonna order takeout, but I noticed Osamu’s got a rice cooker and some decent stuff. How do you feel about homemade onigiri?”

Rina hesitated. “I don’t want to impose…”

“You’re not imposing. You’re the girlfriend—VIP treatment. Plus I need to prove I’m not just a pretty face in a suspicious hoodie.” Atsumi was already heading to the kitchen, rolling up her sleeves.

Osamu looked at Rina, eyebrows raised. She bit her lip, then nodded, a small smile playing at her mouth. “Okay. But only if you let me help.”

“Deal,” Atsumi called over her shoulder. “Fair warning: I’m the boss in the kitchen. Osamu can vouch for that.”

“She’s been like that since we were kids,” Osamu confirmed, guiding Rina toward the kitchen. “She used to make me measure the rice exactly to the grain. One off and she’d start over.”

“Because precision matters,” Atsumi said, already inspecting the rice cooker. “You can’t make good onigiri with sloppy ratios.”

The kitchen was small but functional, narrow counter that forced them all to squeeze together. Osamu’s apartment wasn’t much—a one-bedroom he’d rented after moving to Miyagi to open his shop—but it had a homely warmth. Pots and pans everywhere. A framed photo of their parents. A stack of volleyball magazines Atsumi had already thumbed through.

“So, Atsumi,” Rina said, tying her hair back with a band from her wrist. “Osamu told me you’re a sports journalist? That’s so cool.”

“It’s a job,” Atsumi said, shrugging. “I travel, interview athletes, write about matches. Pays the bills. Sometimes I get free tickets.”

“She’s being modest,” Osamu interjected, pulling out a bag of rice. “She’s one of the top reporters for the volleyball circuit. Players ask for her specifically because she knows the game better than half the coaches.”

Atsumi waved a hand, but a pleased flush crept up her neck. “I do my homework. Helps growing up with a twin who never shut up about serves and receives.”

“You were the one who wanted to watch match replays instead of cartoons,” Osamu shot back.

“Because cartoons are boring. Real drama is watching a libero dig a spike at the last second.”

Rina laughed. “You two are exactly like my brother and me. We used to argue over the remote too. He always won because he was taller.”

“Osamu used to hold the remote above my head,” Atsumi said, giving him a mock glare. “I had to climb on furniture. That’s why I’m good at spiking now—years of training.”

“You never played volleyball.”

“Doesn’t mean I couldn’t have.”

The conversation flowed easy as they prepped ingredients. Atsumi took charge of the rice, rinsing it with practiced efficiency while Osamu chopped vegetables for fillings—pickled plum, tuna mayo, spicy cod roe, his specialty. Rina, who confessed to being a novice, was put in charge of shaping nori sheets and setting the table.

“You’re really good at this,” Rina said, watching Atsumi’s hands. She formed a perfect triangle of rice in one fluid motion, pressing the filling in without breaking a single grain.

“Practice,” Atsumi said. “When you’re a twin, you learn to cook for two. And Osamu eats like a horse.”

“I do not.”

“You ate three bowls of rice at dinner last night. I counted.”

“That was a small bowl.”

“It was a normal bowl. You’re just in denial.”

Rina giggled, setting out chopsticks. “I think it’s sweet that you’re staying with him. Are you really looking for an apartment in Miyagi?”

Atsumi nodded, expression softening. “Yeah. I’ve been in Tokyo for a few years, but I got an offer to cover the Tohoku region for a new sports network. It’s a step up, and I’ve always liked it here. Plus, it means I get to annoy my brother on a regular basis.”

“You’re gonna annoy me every day?” Osamu said flatly.

“Only if you keep forgetting to tell your girlfriend about me. Otherwise, I might give you a break.”

Rina snorted. “I think I’m going to like having you around, Atsumi.”

“Careful,” Osamu muttered. “She’s gonna move in permanently. And she snores.”

“I do not snore.”

“You definitely snore. I can hear it through the wall.”

“That’s the air conditioner. You need to get it fixed.”

They kept bantering as the onigiri came together, the kitchen filling with the warm smell of steamed rice and toasted nori. Osamu moved around his sister with practiced ease—handing her ingredients before she asked, fetching bowls, wiping counters. It was a rhythm from years of shared meals. Rina watched with a fond smile.

“You two work well together,” she said.

“Twenty-three years of practice,” Atsumi replied. “And a lot of fights.”

“Speaking of fights,” Osamu said, “remember that time you threw a meat bun at me because I ate the last of the natto?”

“You deserved it. Natto is sacred.”

“It’s fermented beans. It smells like feet.”

“Your feet, maybe.”

Rina laughed so hard she nearly dropped the nori sheet. “You two are ridiculous. I love it.”

They finished the last onigiri—a neat row of triangles on a big platter, each type labeled with a small strip of paper so Rina could tell them apart. Atsumi insisted on labels because “everyone deserves to know what they’re eating, especially if it’s spicy cod roe.”

They sat down at the small kotatsu table in the living room, the tray of onigiri in the center, plus pickles, miso soup (instant packets, but Atsumi added extra tofu and green onions), and a bottle of cold barley tea.

Rina picked up a tuna mayo onigiri and took a bite. Her eyes widened. “This is amazing. The rice is perfect.”

“See?” Atsumi grinned at Osamu. “Told you the ratio matters.”

Osamu rolled his eyes but took a bite of his own, acknowledging the compliment with a small nod. It was good. Really good. He’d never admit it aloud, but Atsumi’s cooking was always slightly better. She had a touch, a knack for balancing flavors he could only approximate with careful measuring.

As they ate, the conversation drifted. Rina asked about Atsumi’s work, and Atsumi shared anecdotes from the volleyball circuit—the time a famous setter walked into a glass door before an interview, the libero who always brought his pet rabbit to press conferences. Rina talked about her job as a graphic designer, showing them recent projects on her phone.

“This is gorgeous,” Atsumi said, scrolling through a portfolio. “You did the cover for that magazine? The one with the cherry blossoms?”

“Yeah, rush job. Stayed up until three in the morning finishing it.”

“It paid off. The colors are beautiful.”

Rina’s cheeks flushed. “Thanks. I’m really proud of that one.”

“You should be.”

Osamu watched them, a quiet warmth settling in his chest. He’d been nervous about introducing his sister to his girlfriend—not because he thought they wouldn’t get along, but because he wanted it to go perfectly. He’d imagined a nice dinner out, a planned conversation, not this chaotic, accidental meeting that could have gone so wrong.

But here they were: his sister laughing at something Rina said, Rina leaning forward with genuine interest, asking about Atsumi’s travel schedule. They were bonding over skincare routines next—Atsumi showing Rina a sheet mask from Tokyo, Rina recommending a moisturizer for dry climates.

“You have to try this,” Atsumi said, pulling a small tube from her bag. “Sleeping mask. I use it after long flights. Your skin will feel like glass.”

“Oh, I’ve heard of this brand! So expensive in Japan.”

“I get it at a discount through a contact. I’ll send you the link.”

Osamu cleared his throat. “Are you two starting a beauty club?”

“Don’t act like you don’t use my moisturizer when you’re at home,” Atsumi shot back.

“I do not.”

“You do. I saw you. Last Christmas. You thought I was asleep, but I saw you sneak into the bathroom and use three pumps of my night cream.”

Rina burst out laughing. “Osamu! You traitor.”

“It was cold!” he protested. “My skin was dry!”

“Uh-huh. Sure.” Atsumi winked at Rina. “I’ll teach you all his secrets later.”

The meal wound down slowly. They finished the last onigiri, soup bowls empty, barley tea nearly gone. Outside, the sky had darkened, streetlights casting a soft orange glow through the window.

Rina checked her phone and sighed. “I should probably head home. Early meeting tomorrow.”

“I’ll walk you to the station,” Osamu said, already getting up.

“No, no, it’s fine. Only two blocks. And you have a guest.” Rina looked at Atsumi, genuine smile. “It was really nice meeting you, Atsumi. Sorry again about the misunderstanding.”

“Don’t worry about it,” Atsumi said, standing to give her a quick hug. “Glad we met. And glad my brother finally found someone who can put up with his terrible communication skills.”

“Hey,” Osamu said.

“It’s true and you know it.”

Rina laughed, squeezed Atsumi’s hand. “We should do this again. My treat next time.”

“I’ll hold you to that.”

Osamu walked Rina to the door, slipping on his shoes to at least go to the building’s entrance. At the door, Rina turned, expression soft.

“She’s wonderful, Osamu. I’m really happy I met her.”

“Yeah. She’s a pain, but she’s my pain.”

Rina leaned up and kissed him lightly on the cheek. “Thanks for having me over. Even if it was an accident.”

“I’ll text you tomorrow. And I’ll set that reminder.”

“You better.”

She waved goodbye, and Osamu watched her walk down the hall until she disappeared around the corner. Then he went back inside, closing the door quietly.

Atsumi was already in the kitchen, rinsing dishes. “She’s nice,” she said without turning.

“Yeah. She is.”

“She’s also clearly crazy about you. You should have seen her face when she thought I was your mistress. I thought she was gonna throw a vase.”

Osamu leaned against the counter, arms crossed. “You handled it well.”

“I have practice. Remember when Mom walked in on us pretending to be each other for a school project? She thought I was you because I had your voice down.”

“You didn’t have my voice down. You just spoke in a monotone.”

“Worked, didn’t it?”

Osamu smiled, small and genuine. “Thanks for not making it weird. Could’ve been bad.”

Atsumi turned off the water, faced him, drying her hands on a towel. “Osamu, I’m your sister. It’s my job to make sure you don’t screw up your relationships. And honestly? I like her. She’s got fire. I approve.”

“I wasn’t asking for your approval.”

“You got it anyway.”

He shook his head, but the warmth in his chest hadn’t faded. “Want to watch that match replay I recorded? Last week’s finals?”

Atsumi’s eyes lit up. “You recorded it?”

“Knew you’d wanna see it.”

“You’re not totally useless after all.”

“Shut up.”

They settled on the couch, pulled up the recording on the TV. Atsumi grabbed a blanket from the back of the sofa and draped it over her legs, and Osamu handed her a bag of chips he’d stashed.

“You’re a good brother,” she said quietly as the opening whistle blew.

“Don’t let it get around.”

“Wouldn’t dream of it.”

They watched the match in comfortable silence, broken only by occasional commentary and Atsumi’s excited yells when a player made a good dig. Osamu found himself smiling more than usual. The apartment, which had felt too quiet for too long, now felt full—laughter, warmth, the familiar presence of his sister.

He thought about Rina, probably already on the train home, and how lucky he was that she’d believed him, that she’d laughed instead of cried, that she’d stayed for dinner.

He thought about Atsumi, who had dropped everything to visit, charmed his girlfriend in minutes, was now elbowing him in the ribs because she wanted him to rewind a play.

“Pay attention,” she said. “That was a perfect serve receive.”

“I saw it.”

“Then why aren’t you cheering?”

“Because I’m not a loud idiot like you.”

“Loud idiot? I’ll have you know I’m a professional loud idiot. It’s on my business card.”

He laughed, and the sound surprised even him. Atsumi grinned, eyes crinkling.

“See?” she said. “This is good. This is what we needed.”

“Yeah,” Osamu agreed, settling deeper into the couch. “Yeah, it is.”

The match ended with a dramatic tie-breaker, and Atsumi spent the next twenty minutes analyzing every play, pointing out strategies and mistakes with the fervor of a true fan. Osamu listened, interjecting occasionally, and for a while they were just two twins, sharing a space, sharing a love for the game, sharing a quiet evening that felt like a promise of more to come.

Later, when Atsumi finally yawned and declared she was turning in, Osamu grabbed a spare pillow from the closet and tossed it onto the couch.

“Thanks for letting me crash,” she said, pulling the blanket up to her chin.

“Anytime. Just warn me next time so I can actually tell my girlfriend.”

“No promises. I like the drama.”

“You’re impossible.”

“And you love me.”

Osamu paused at the doorway, looked back at his sister—lanky and ridiculous, hair splayed across the pillow, content smile on her face. “Yeah,” he said softly. “I do.”

He clicked off the light.

In the morning, he’d make breakfast. He’d text Rina a good morning. He’d start looking at apartment listings for Atsumi, maybe help her find a good place nearby.

But for now, he stood in the hallway, listening to his sister’s breathing even out, and felt a rare, peaceful quiet settle over him.

This was good.

This was exactly where he was supposed to be.