New Toss, Same Twin

The first day of spring semester at Inarizaki High started like any other—kids shuffling through the gates, teachers herding everyone toward homeroom, that low hum of gossip that never really stops. But for Atsumu Miya, it was the first day of the rest of her life.

She walked through the halls with her head high, same swagger, but now she wore the girls’ uniform: crisp white blouse, navy pleated skirt, soft mary janes instead of loafers. Hair still messy blond, tied back with a simple black ribbon. She’d been planning this for months, ever since she finally said out loud that the boy she’d been pretending to be wasn’t real. Coming out to her parents? Terrifying. But they hugged her and said they loved her no matter what. The school was surprisingly cool about it—quiet meeting with the principal, a note from her therapist, a new name on the roster: Atsumu Miya, female.

Now all she had to do was face her teammates.

The gym doors loomed ahead. Practice wasn’t until after school, but the volleyball club had a morning meeting to talk about new members and upcoming tournaments. Atsumu pushed the door open. Every head turned.

The room went quiet.

Captain Kita Shinsuke stood at the front, clipboard in hand, face unreadable. Ginjima and Suna leaned against the wall. Osamu was already there, sitting on a bench with his arms crossed, staring at the floor. He hadn’t looked at her once since she’d walked in.

Atsumu had expected this. Her brother had been avoiding her ever since she told him. He grunted something like “Whatever” and disappeared into his room. They’d barely spoken for two weeks.

“Good morning,” Atsumu said, voice steady. She set her bag down and faced the team. “I’m Atsumu Miya. I’ve started hormone therapy. I’m a girl now. Questions?”

Ginjima blinked. “Uh… does this mean we can’t call you ‘Tsumu’ anymore?”

“You can still call me Tsumu.” She grinned. “Just not handsome Tsumu. Try beautiful instead.”

Suna snorted, covering his mouth with his hand. Kita nodded once, like he was confirming routine paperwork. “Understood. We’ll update the roster. Welcome, Atsumu.”

And that was that. The team accepted it with the same pragmatic efficiency they brought to receiving serves. No drama, no judgment. Just a few awkward questions about pronouns (she/her) and a quick discussion about which bathroom she’d use (the girls’, obviously). Atsumu felt a weight lift off her shoulders.

But Osamu still wouldn’t look at her.

Over the next few weeks, that distance became a canyon. They’d shared a room since birth—twin beds, twin desks, twin everything—but now Osamu moved his futon to the far corner and pretended to be asleep whenever Atsumu came in. At breakfast, he’d grab toast and leave without a word. At practice, he’d pass to her with mechanical precision—just the ball, no eye contact, no banter.

It hurt more than Atsumu wanted to admit.

“Your brother’s being a dick,” Suna observed one afternoon during a water break. They sat on the gym floor, towels around their necks, watching Osamu drill serves alone on the far court.

“He’s not a dick,” Atsumu said, though her voice wavered. “He just doesn’t get it.”

“Yeah, well, he needs to get it.” Suna shrugged. “You’re still you.”

But Atsumu wasn’t entirely sure she was the same. The hormones were working—she could feel it. Her body was changing. Her chest grew tender, and two small buds formed beneath her nipples, then slowly rounded into breasts. Nothing dramatic, but enough to need a sports bra. Her skin softened, her jawline lost some of its harshness. She’d started wearing light makeup—just mascara and lip gloss—and feminine clothes off the court: flowy blouses, high-waisted shorts, a delicate silver necklace.

On the court, she wore a loose jersey and shorts, but underneath she had on a crop top instead of a regular undershirt. More comfortable, gave her freedom to move without fabric bunching. She didn’t think much of it.

Until the practice match against the B team.

Routine drill—quick attacks, covering tips, all at full intensity. Atsumu set for Osamu, a perfect quick to the left, but their B-team spiker sent a wild ball careening toward the net. Osamu dove to save it, his body twisting, and his hand came down hard—right on Atsumu’s chest.

Impact solid, sensation immediate. Atsumu’s breath hitched. Osamu froze, his palm still pressed flat against her left breast. The gym seemed to hold its breath. Then Atsumu burst out laughing.

“Samu! Get your hand off my boobs!” she yelled, shoving him away. She was grinning, embarrassed but more amused than anything.

Osamu stumbled back, his face turning a shade of red that rivaled the gym floor. “I—I didn’t mean—it was an accident—”

“Yeah, I know!” Atsumu laughed harder. “Don’t look so freaked out. They’re just body parts.”

But Osamu looked mortified. He turned and walked to the bench, sat down hard, and stared at his hand like it had betrayed him. The rest of the team exchanged glances, then pretended the moment hadn’t happened. Practice resumed.

Atsumu noticed, though, that Osamu avoided her even more after that. He wouldn’t stand next to her in warm-ups, wouldn’t even brush against her accidentally. She’d become radioactive.

The locker room situation didn’t help.

Atsumu decided to keep changing with the boys. Didn’t want to make a big deal out of it. The girls’ locker room felt foreign. The boys’ locker room she knew—the smell of sweat and deodorant, the sound of cheap metal lockers slamming, the crude jokes about practice. She slipped in after practice, bag over her shoulder, and started unbuttoning her jersey.

The B-team players, who hadn’t been there for the earlier incident, froze mid-change. One of them, a first-year named Hirano, was holding his shorts halfway up, mouth open.

“Miya-san… aren’t you… I mean, you’re a girl now, right?” he stammered.

Atsumu pulled off her jersey, revealing the lace-trimmed bralette she’d worn that day—delicate lavender, with a little bow in the center. She’d bought it at a boutique downtown, feeling girly and pretty for the first time. Didn’t think twice.

The team, however, did.

From behind her, a strangled noise escaped Ginjima. “Tsumu, what the hell are you wearing?”

Atsumu glanced down at her chest, then back at him. “A bra? You’ve seen bras before.”

“Not on you!” Ginjima’s ears were crimson.

Suna leaned against a locker, phone out, clearly taking a picture. “This is going on the group chat.”

“Don’t you dare,” Atsumu said, but she was laughing. “You’re all so weird. It’s just underwear.”

Osamu was on the far side of the room, back turned, pulling his jacket on so fast he almost ripped the zipper. He didn’t say anything, but Atsumu saw his shoulders tighten. She felt a pang of frustration.

That evening, after everyone else had left, Osamu cornered her in the hallway outside the gym.

“You can’t keep changing with the boys,” he said, voice flat, eyes fixed on the floor.

Atsumu crossed her arms. “Why not? They don’t care.”

“I care.”

“Well, that’s your problem, isn’t it?” She stepped closer. “I’m still the same person, Samu. I’ve always been a girl. Now I just look like one.”

His jaw clenched. “You look different.”

“Yeah, I do.” She softened her tone. “And I’m happy. Can’t you be happy for me?”

Silence stretched between them. Osamu looked at her then—really looked, for the first time in weeks. His gaze took in her smaller frame, the gentle curve of her hips, the way her lashes caught the light. Something flickered in his eyes, but it was gone before she could name it.

“I don’t know how to act around you anymore,” he muttered.

“Act normal. Tease me, fight with me, set to me.” She grabbed his hand and pressed it to her cheek. “Feel that? Same face. Same twin. Just with boobs now.”

He pulled away like he’d been burned. “Stop that.”

“Make me.” She grinned.

He shook his head and walked off, but she saw his lips twitch—the ghost of a smile. It was a start.

The team held an official meeting the next day. Kita, ever the diplomat, called everyone into the gym after school and stood at the front, arms crossed.

“This is about the locker room situation,” he said. “Atsumu wants to keep using the boys’ changing area. Some of you are uncomfortable. Let’s talk.”

A chaotic debate ensued. Hirano raised his hand and said, “It’s weird because she’s pretty now!” then immediately turned purple and hid behind a bench. Suna argued that it was no different from co-ed hot springs, which made no sense but made several people laugh. Ginjima admitted he was scared of accidentally looking at her “wrong” and being accused of something. The libero, Michinari, suggested they build a curtain booth, then got tackled by the wing spiker.

Atsumu watched it all unfold, arms crossed, fighting a smile. They were trying. All of them.

Finally, Kita raised his hand. Silence fell.

“Atsumu is a member of this team,” he said, his quiet voice carrying authority. “If she’s comfortable changing with us, we’ll support her. If she decides to use the girls’ locker room, we’ll support that too. She chooses.” He looked at her. “What do you choose?”

Atsumu looked around the room at her teammates—red-faced, awkward, but good-hearted. She thought about the girls’ locker room, unfamiliar smells, strangers who didn’t know her. Then she thought about Osamu, rigid and uncomfortable, and how she’d been teasing him on purpose.

“I’ll use the girls’ locker room,” she said. “But only because it’ll annoy Osamu less.”

Everyone sighed in relief. Osamu didn’t look at her, but his shoulders relaxed.

“And,” Atsumu added, grinning, “I’m still coming in to bug you guys before practice. Can’t miss the entertainment.”

The team groaned, but there were smiles all around.

Osamu stayed late that evening, drilling serves long after the others left. Atsumu found him on the court, the gym echoing with the thud of balls hitting the floor.

“You’re going to wear out your arm before the tournament,” she said, walking onto the court.

“Go away.”

“Nope.” She picked up a ball and bounced it. “You’re not getting rid of me that easy. Let’s practice quicks.”

He finally looked at her. “What’s the point? We can’t even bump into each other without it being weird.”

“Then we’ll get un-weird.” She set the ball high. “Come on. Set to me. Same as always.”

He studied her for a long moment, then picked up a ball. “Fine. But if you miss, I’m not buying you dinner.”

“You never buy me dinner.”

They fell into rhythm. The old sync was still there—that effortless connection that made them the best setter-spiker duo in the prefecture. Atsumu moved left, Osamu set right. The ball found her hand every time. They ran drill after drill until sweat dripped from their chins and their lungs burned.

“You’re slower,” Osamu said after a particularly fast attack. “On your approach.”

“Boobs throw off my balance,” she shot back. “They’re new.”

He snorted. Couldn’t help it. “That’s gross.”

“It’s biology, Samu. Look it up.”

They practiced together every evening after that. Slowly, the stiffness between them melted. They talked about ordinary things—food, practice, their mom’s awful attempts at baking healthy snacks. Osamu still avoided touching her, but the horror was fading, replaced by something like grudging acceptance.

The climax came during a practice match against Shiratorizawa. Friendly scrimmage, but with Nationals on the horizon, everyone was going hard. The ball flew fast and furious. Atsumu was in the front row, waiting for a set from the second-string setter, when a Shiratorizawa spiker unleashed a line shot aimed straight at her face.

Time slowed. No way she could react fast enough.

Then Osamu was there, his body curving around hers, arms wrapping her in a protective cage. His back took the full force of the spike—loud, meaty thwack—and he grunted, stumbling but holding on.

Atsumu froze, her face pressed against his chest. He smelled like sweat and fabric softener. His arms were tight around her, his breath ragged. The gym went silent.

“You okay?” he grunted.

She pulled back enough to look at him. “You just took a spike to the spine for me.”

“Don’t get used to it.” But he didn’t let go. Instead, he tightened his grip, almost imperceptibly, and murmured, “You’re still my twin, whether you’re a girl or not.”

Atsumu’s heart swelled. She grinned up at him, familiar mischief in her eyes. “Took you long enough, Samu.”

The team erupted. Suna wolf-whistled. Ginjima clapped. Kita nodded approvingly from the sidelines. Even the Shiratorizawa players paused, a few of them smiling.

Osamu shoved her away, blushing furiously. “Shut up. We’re still losing the next point.”

“Not with me setting,” she said, grabbing the ball. “Let’s show them what the Miya twins can do.”

They finished the match with a flourish, their infamous quick attack leaving the Shiratorizawa blockers flat-footed. The gym filled with cheers. Atsumu felt lighter than she had in months.

After that, everything fell into place. Osamu stopped flinching when she touched him. He even started teasing her again—calling her “princess” in a mocking voice when she complained about cramps, stealing her onigiri, generally being the annoying little brother she knew and loved.

Atsumu decided to use the girls’ locker room for practical reasons, as she’d promised. But every now and then, after a particularly rough practice, she’d barge into the boys’ side, small bag in hand, just to watch them scramble.

“Tsumu, get out!” Ginjima would yell, clutching a towel to his chest.

“Relax, I’ve seen it all before,” she’d reply, grinning, throwing her bag on the bench. “Just need my deodorant.”

Osamu would roll his eyes and smear toothpaste on her bag handle while she wasn’t looking. She’d come back to find it sticky and fling her shoe at his head. They’d chase each other around the locker room until Kita threatened to make them run laps.

They were still the Miya twins—bickering, competitive, inseparable. Only now, Atsumu wore a skirt, and Osamu didn’t care.

One evening in early summer, they sat on the gym steps, watching the sun dip behind the cherry blossoms. Atsumu leaned back on her hands, legs dangling, a soda can cool against her palm.

“Hey, Samu.”

“What?”

“Thanks. For trying.”

He didn’t answer for a long moment. Then he nudged her shoulder with his. “You’re still annoying.”

She laughed. “And you’re still a grumpy ass. But I guess we’re stuck with each other.”

“Yeah.” He cracked a small smile. “I guess we are.”

Somewhere on the court, a volleyball bounced lazily across the floor. Cherry blossoms drifted down like pink snow. Atsumu looked at her brother—messy hair, bony shoulders, that stupid grumpy face—and felt an unshakeable warmth.

She was Atsumu Miya. A girl, a setter, a twin, a force of nature. And nothing, not even a little awkwardness, could change that.