The Unexpected Set

The first time Atsumu Miya announced she was a girl, it was during homeroom on the second day of spring term. She stood up, slapped her palms flat on the desk, and declared it like she was calling a quick set.

"Oi. I’m a girl. Just so y’all know."

Class went dead quiet. A couple kids blinked. Matsumoto—two rows over—dropped his eraser.

Then Kageyama-sensei, this tired woman in her forties who’d obviously seen weirder, just adjusted her glasses and said, "Thank you for telling us, Miya-kun. Miya-san, I suppose? I’ll update the roster. Please sit down."

That was it. Whole reaction.

Atsumu sat back down, heart hammering, and thought, Huh. That went way better than I thought.

The volleyball team didn’t even blink. When she told them at practice that afternoon, Sunagawa just shrugged. "Cool. Can you still set?" Ginjima asked if she wanted different nickname options. Kita nodded once and said, "I’ll adjust the practice schedules accordingly."

Osamu, standing next to her with a towel around his neck, went very still. Atsumu noticed—because she always noticed when Osamu did anything. Twin thing. Or maybe just a "knowing your exact copy" thing.

"You good?" she asked later, walking home.

He was quiet for a long time. Then: "So you’re a girl now."

"Yeah."

"Like. Actually."

"Osamu, I literally just told the whole class and the whole team. What part of this ain’t gettin’ through your thick skull?"

He didn’t answer. Just kept walking, hands shoved in his pockets, face unreadable.

That was the start of what Atsumu would later call The Great Osamu Panic of Spring.

---

At first, it was subtle. Osamu started walking on the outside of the sidewalk, closest to the road. He opened doors for her. Offered to carry her gym bag. When they grabbed food from the convenience store, he pushed the onigiri toward her first and said, "You pick first."

Atsumu stared at him like he’d grown a second head.

"What are you doin’?"

"Nothin’."

"You’re bein’ weird."

"I’m bein’ polite."

"You’ve never been polite a day in your life. Last week you told Grandma her stew was ‘acceptable.’ She cried."

Osamu’s ears went red. "That’s different."

It wasn’t different. It was bizarre. And as the weeks went on, it only got worse.

He started hovering. During practice, if Atsumu went for a hard dive, Osamu would flinch like he expected her to shatter. If a serve came at her too fast, he’d step forward like he was about to block for her. Ridiculous. Atsumu was a first-year starter on one of the best high school teams in the country. She could take a hit.

"Stop babysitting me," she snapped one afternoon, after Osamu bodily stepped in front of her during a drill.

"I wasn’t babysittin’."

"You literally just used your face to block a ball that was comin’ right at my hands."

"Your hands are important."

"So is your face, apparently, but you didn’t seem to mind usin’ it as a shield."

Osamu scowled and rubbed his nose. Took the impact pretty hard. There was a red mark blooming across his cheek. Atsumu felt a tiny flicker of guilt, but squashed it. Not about to encourage this.

"I’m fine," she said firmly. "I’m still me. Just a different version. You don’t gotta treat me like I’m made of glass."

"I ain’t."

"You are."

"I’m not."

"You literally just—"

"Alright, enough." Kita appeared between them, quiet menace like a cat who’d decided the mice were too loud. "Both of you. Run laps."

They ran. Atsumu was faster. She always was.

---

Spring turned to early summer. Atsumu started estrogen treatment. Not a dramatic overnight change, but the small shifts added up. Skin softer. Face lost some of its sharpness. Voice didn’t drop the way it might have. And her hair—starting to grow longer, faster, curling at the ends in a way that made her look almost delicate.

She hated that word. Delicate. She could still spike a ball hard enough to bruise a blocker’s palms.

But Osamu was apparently incapable of seeing that.

The first time she forgot to put on a shirt after practice was an accident. So tired she just peeled off her sweaty jersey and stood there in her sports bra, digging through her bag for a clean shirt. Locker room mostly empty. Just her and Osamu, who’d been tying his shoes on the bench.

He looked up.

Went rigid.

His face cycled through about seven shades of red in two seconds.

"Atsumu!" he yelped, voice cracking in a way it hadn’t since they were thirteen.

Atsumu looked at him. Then down at herself. Then back at him.

"What?"

"Put a shirt on!"

"I’m lookin’ for one."

"Look faster!"

"Quit yellin’. Gonna attract attention."

Osamu made a sound like a kettle coming to a boil. He yanked his own gym bag toward him, fumbled with the zipper, and flung the first thing he grabbed directly at her face. Turned out to be his spare practice jersey. Smelled faintly of sweat and fabric softener. Atsumu pulled it off her head and glared.

"The hell was that for?"

"You can’t just—walk around like that!" Still red. Ears practically glowing.

"Like what? I’m in a sports bra. Normal."

"It ain’t normal!"

"It is for girls."

"You—I—we shared a womb, Atsumu!"

Atsumu blinked. Then burst out laughing.

Laughed so hard she had to brace herself against the lockers. Osamu looked three seconds away from digging a hole to the center of the earth and hiding there forever.

"Oh my god," she wheezed. "You’re such a mess. We’re twins. It’s not like you ain’t seen me before."

"When we were babies!"

"We ain’t babies now, but I still saw you naked three weeks ago when you forgot your towel."

"That was different!"

"How?"

Osamu didn’t have an answer. Just made another strangled sound and stormed out, leaving his bag behind. Atsumu was still laughing when she finally found her shirt.

---

This became a pattern.

Osamu found creative ways to avoid looking at Atsumu when she was changing. Turn his back. Hide behind a locker door. Suddenly become very interested in ceiling tiles. Once, ran face-first into a doorframe because he was trying so hard not to look in her direction.

Atsumu, for her part, found this absolutely hilarious.

She wasn’t trying to be cruel. She just genuinely didn’t see the problem. She’d been in this body her whole life. Only difference now was that she actually liked it. And she was comfortable. Didn’t see why Osamu had to make it weird.

"You’re makin’ it weird," she told him one evening, sitting on the floor of their shared room at home, doing homework.

"I ain’t."

"You keep avoidin’ eye contact."

"I’m readin’."

"Your book is upside down."

Osamu looked down. It was, in fact, upside down. He slammed it shut and threw it across the room.

"Fine!" he snapped. "Maybe I’m havin’ a hard time adjustin’, alright? You can’t just expect me to be fine with everything overnight."

Atsumu softened. Set her pencil down. "I know. I’m sorry. I ain’t tryna make this hard for you."

"You ain’t makin’ it hard," he muttered. "I’m just—I gotta figure out how to see you different. You’re my twin. Always been my twin. And now you’re my sister, and I don’t know how to do that."

"There ain’t a manual for it," Atsumu said, and smiled a little. "But you’re doin’ fine. Except for the part where you keep throwin’ clothes at my face."

Osamu snorted. "You keep forgettin’ to put ‘em on."

"I’ll try to remember."

"Good."

Pause. Then, very quiet: "I’m proud of you, though. For what it’s worth."

Atsumu’s chest went tight. She looked down at her hands. "Thanks."

"Don’t make it weird."

"You’re the one who said it."

"Shut up."

They sat in comfortable silence after that. Most they’d talked in weeks.

---

Bottom surgery came in April, during spring break. Atsumu had been preparing for months—consultations, paperwork, a whole lot of conversations she never thought she’d have at sixteen. But she wanted this. Needed it. When she woke up in the hospital bed, groggy and sore and feeling like she’d been hit by a truck, she also felt more like herself than ever before.

She cried. Osamu was there, sitting in the chair beside her bed, holding her hand and looking profoundly uncomfortable with the amount of emotion happening.

"You good?" he asked.

"Yeah," she whispered. "Really good."

He squeezed her hand once, then let go. "Good. Don’t make me do that again."

"Do what?"

"Be emotional. I hate it."

She laughed, and it hurt, but she didn’t care.

---

Recovery was slow, but Atsumu was stubborn. Back in the gym within three weeks, cleared by her doctor and ready to set. The team was supportive. Kita made sure she didn’t overdo it. Sunagawa brought her sports drinks. Even Ginjima—not a talker—gave her a thumbs-up and said, "Welcome back."

Only problem was, in the chaos of recovery, Atsumu forgot to update her locker room habits.

It happened gradually. She’d walk toward the boys’ locker room out of habit, catch herself, redirect. But sometimes, tired or distracted, she slipped. And since the boys’ locker room had been hers for the first few months of the school year, she still had muscle memory.

First post-surgery incident happened on a Tuesday.

Practice ran late. Exhausted, hungry, barely thinking. Walked into the boys’ locker room, dropped her bag, started stripping off her jersey before she realized.

Osamu, Sunagawa, and two second-years were still there.

Sunagawa made eye contact. Then looked away very quickly.

Osamu made a sound that was half-scream, half-sob.

"Atsumu!"

"What?"

"This is the boys’ locker room!"

"Oh." She looked around. "Huh. So it is."

Grabbed her bag and walked out. Calm as anything. Osamu followed her into the hallway, sputtering.

"You can’t just—walk in there like that! What if someone had been naked?!"

"You were all half-dressed anyway. Ain’t like I saw anything new."

"That ain’t the point!"

"What is the point?"

"The point is—you’re a girl now! You gotta use the girls’ locker room!"

"I know that!"

"Then why ain’t you doin’ it?!"

"Because I forgot!"

"How do you forget?!"

"I don’t know, Osamu! I had surgery three weeks ago! Still gettin’ used to things!"

They stood in the hallway, breathing hard, glaring. Then, slowly, the absurdity sank in. Atsumu’s lip twitched. Osamu’s eye twitched. And then they both started laughing.

"You’re such an idiot," Osamu said, but he was smiling.

"Takes one to know one."

---

The incidents kept happening.

Not every day, but often enough that Osamu developed a permanent twitch in his left eye. Atsumu would forget her towel and walk back to the locker room half-damp. Or change her shirt in the hallway outside the gym because she didn’t want to walk all the way to the girls’ room. Wasn’t trying to be careless. Just genuinely didn’t think about it.

Her body felt like hers now. Wasn’t ashamed of it. Didn’t feel the need to hide.

Osamu, unfortunately, did not share this lack of shame.

"You gotta stop flashin’ me," he said one afternoon, after she’d changed her sports bra in front of him because she claimed it was "too hot" to walk to the other locker room.

"I ain’t flashin’ you. I’m changin’."

"In front of me."

"You’re my brother. It’s fine."

"It is not fine!"

"Why not?"

"Because you’re a girl!"

"And?"

"And I’m a guy!"

"So?"

"So you can’t just—change in front of guys!"

"You ain’t ‘guys,’" she said, making air quotes. "You’re you. And Sunagawa. And Ginjima. And Kita. They don’t care."

"They absolutely care!"

"Sunagawa literally fell asleep on the bench last time. Didn’t see anything."

"That ain’t the point!"

Atsumu sighed, loud and dramatic. "Alright. Fine. I’ll try harder."

"Thank you."

"But you gotta stop treatin’ me like I’m gonna break."

Osamu went quiet. He looked at her—really looked at her—for the first time in weeks. She was standing there in practice shorts and a loose tank top, hair tied back, arms crossed, chin lifted. Looked confident. Happy.

Looked like his sister.

"I’ll try," he said finally.

"Good."

"But if you walk into the boys’ locker room one more time, I’m tellin’ Kita."

"You wouldn’t."

"Try me."

She grinned. Same grin she’d always had. The one that said she was about to be a problem.

Osamu sighed. Some things never changed.

---

The climax came during the overnight training camp in early July.

Three-day event at a facility in the mountains. Team shared a large room with bunk beds and sliding doors. Girls’ room down the hall. Boys’ room—where all the Inarizaki players were staying, plus a few other teams on different floors.

Second night, Atsumu made a critical error.

She’d taken a shower in the girls’ bathroom, but left her change of clothes on her bunk. In the boys’ room. Because she hadn’t been thinking. Because she was exhausted from three straight hours of drills.

So she did the logical thing: wrapped a towel around herself and walked down the hall to get her clothes.

She was not expecting the door to slide open so easily.

She was not expecting every single member of the Inarizaki boys’ volleyball team to be in the room at that exact moment.

She was especially not expecting Osamu to be sitting cross-legged on his bottom bunk, mid-bite of an onigiri, staring at her like she’d just grown a second head.

Time stopped.

Room went silent.

Sunagawa dropped his phone. Ginjima made a noise like a strangled cat. Kita, the only one with any composure, slowly put down the book he was reading and said, "Miya-san. The girls’ room is down the hall."

"I know," Atsumu said, very quietly.

"Your clothes are on your bunk," Kita added.

"I know."

"Do you want me to get them for you?"

"Yes. Please. Thank you."

Kita stood up, walked to her bunk with the calm of a man who had seen too much, grabbed her clothes, and handed them to her without looking.

Atsumu took them. Didn’t move.

"You can leave now," Kita said.

"Right. Yeah. Leaving."

She turned to go.

And then Osamu found his voice.

"ATSUMU!"

She winced. "I know, I know, I’m sorry—"

"You’re in a TOWEL!"

"I forgot my clothes!"

"HOW DO YOU FORGET YOUR CLOTHES?!"

"I had a long day!"

"WE ALL HAD A LONG DAY!"

"THAT DOESN’T MEAN I’M NOT TIRED!"

"THAT DOESN’T MEAN YOU GET TO WALK AROUND HALF-NAKED!"

"I’M FULLY COVERED! THIS IS A BATHING TOWEL!"

"IT’S NOT A BATHING TOWEL, IT’S A HAND TOWEL!"

"IT’S A MEDIUM TOWEL!"

"THAT’S NOT A REAL CATEGORY!"

Sunagawa, who’d retrieved his phone, was quietly recording. Ginjima was trying to hide laughter behind his hand. Kita had sat back down and resumed reading like nothing was happening.

Atsumu and Osamu stared at each other across the room. He was still holding his onigiri. She was still holding her clothes. The towel was slipping.

"I’m gonna go," she said.

"GOOD."

"I’ll put clothes on."

"PLEASE DO."

"And then I’m gonna come back and kick your ass in cards."

"You wish."

She grinned, and slid the door shut behind her. The room exhaled.

Osamu dropped his onigiri. Put his head in his hands.

"I need a new life," he said.

Kita turned a page. "Don’t we all."

---

Later that night, after things settled and lights were off, Osamu found Atsumu sitting on the roof. Wasn’t hard to get to—fire escape off the second-floor landing—and he climbed up to find her staring at the stars, still in her pajamas.

"Hey," she said, not looking at him.

"Hey." He sat down next to her, leaving a respectful foot of space. "You good?"

"Yeah. Just thinkin’."

"About what?"

She was quiet for a moment. Then: "I keep messin’ up."

Osamu blinked. "What?"

"The locker room stuff. The towel stuff. I keep doin’ things that make you uncomfortable, and I ain’t tryin’ to. I just—I don’t think about it. I feel like me now. And I forget that other people don’t see me the way I see me."

Osamu didn’t say anything. Just stared at the stars.

"I’m sorry," she continued. "I know I been makin’ this hard for you. I’ll do better. Use the girls’ room. Stop flashin’ everybody. Be more careful."

"I don’t want you to be careful," Osamu said.

She turned to look at him. "What?"

He rubbed the back of his neck. "I mean—I don’t want you to feel like you gotta hide. That ain’t what I want. I just—I’m still gettin’ used to it. And every time you walk around without a shirt, my brain short-circuits. It ain’t because I’m ashamed of you. I’m not. Proud of you. I just ain’t used to it yet."

"It’s been four months."

"I’m slow, alright?"

She laughed. Soft, genuine. "Yeah. You are."

"Shut up."

They sat in silence for a while. Then Osamu said, quiet, "You really are my sister now."

Atsumu felt her throat tighten. "Yeah. I am."

"I think I’m finally seein’ that."

"Took you long enough."

"I said I was slow."

"You did."

He bumped her shoulder with his. "Don’t make me get emotional again. Hate it."

"I know."

"Good."

They looked up at the stars. Atsumu leaned her head against his shoulder. He let her.

For the first time in months, everything felt right.

---

After the training camp, Atsumu made a conscious effort. Use the girls’ locker room. The girls’ bathroom. Stop walking around half-naked in front of her brother. Took a week before it became habit. Two weeks before she stopped having to remind herself.

Osamu, for his part, stopped flinching every time she walked into a room. Stopped hovering. Started treating her like he treated everyone else—with the same casual annoyance and barely concealed affection that had always defined their relationship.

It was nice.

Until the trip to Tokyo.

---

The incident happened on the last day. Team had finished exhibition matches and was packing to head home. Atsumu changed in the women’s restroom, but forgot to put on her undershirt. Realized it halfway to the bus.

"Ah, crap."

She turned around, intending to go back, but then spotted Osamu near the bus door, talking to Kita. She waved.

"Oi! Osamu! I forgot my—"

"NO."

"You don’t even know what I was gonna say!"

"I don’t care. The answer is no."

"I was just gonna ask if you have an extra undershirt!"

Osamu stared at her. Then reached into his bag, pulled out a folded white undershirt, and threw it at her face.

It hit her square in the nose.

"You could’ve just handed it to me," she said, pulling it off her head.

"Where’s the fun in that?"

She grinned. Pulled the shirt on. A little big, but smelled like him—laundry detergent and faint hint of rice. Comfortable.

She got on the bus and sat next to him. He didn’t complain.

"Thanks," she said.

"Don’t mention it."

"I mean it."

He glanced at her. Small smile tugged at the corner of his mouth.

"Yeah," he said. "I know."

She smiled back.

And for the rest of the ride home, they bickered about music choices, argued over who got the window seat, and generally acted like the twins they had always been.

Nothing had changed.

Everything had changed.

And Atsumu Miya had never been happier.