It was a peaceful afternoon at Seigaku. Most of the regulars were on the courts, but off to the side, Tomoka was enthusiastically teaching Sakuno how to dance to TWICE's "Heart Shaker."

"No, no, Sakuno-chan! Like this!" Tomoka demonstrated the move with exaggerated enthusiasm.

Sakuno, struggling to keep up, tried to copy her. "L-Like this?"

Tomoka frowned. "Hmm… almost! But your hand should be more like—"

Before she could finish, a shadow loomed over them.

The girls turned slowly—and froze.

Tezuka Kunimitsu was standing behind them.

Silent. Serious. Arms crossed.

"T-Tezuka-senpai?!" Sakuno squeaked.

Tomoka blinked in confusion. "Uh… can we help you, Tezuka-san?"

Tezuka adjusted his glasses.

"You're doing it wrong."

Silence.

The wind blew softly. Somewhere in the distance, a crow cawed.

Tomoka frowned. "Huh?"

Without another word, Tezuka stepped forward.

And then—

With perfect timing, precision, and shocking fluidity—

Tezuka Kunimitsu flawlessly executed the "Heart Shaker" dance.

Tomoka and Sakuno's souls left their bodies.

His hand placements? Sharp.
His movements? Crisp.
His confidence? Unwavering.

It was as if he had trained for this moment his entire life.

Tomoka grabbed Sakuno's arm in shock. "SAKUNO-CHAN. AM I HALLUCINATING?"

Sakuno covered her mouth. "T-Tezuka-senpai… how do you know this?!"

Tezuka finished the move effortlessly, adjusted his glasses, and calmly replied—

"I've seen it before."

That was not an answer.

Before the girls could question him further, the sound of racket bags dropping made them turn—

Standing just a few feet away were the Seigaku boys regulars. All of whom had just witnessed everything.

Eiji screamed.

Momoshiro collapsed to his knees. "BUCHOU—BUCHOU CAN DANCE?!"

Kaidoh looked personally offended.

Oishi's jaw dropped. "Tezuka, since when?!"

Fuji's smile was blinding. "Oh my. I wish I had recorded that."

Ryoma, in utter disbelief, muttered, "What kind of timeline is this…"

Kawamura, still holding his racket, whispered, "That was… that was amazing."

Meanwhile, Inui had already pulled out his notebook and was furiously scribbling.

"New data: Tezuka Kunimitsu possesses advanced-level dance skills, specifically in K-pop choreography. Accuracy rate: 99.8%. Source: Unknown. Possible exposure: Secret ONCE? Further observation needed."

Tezuka, completely unbothered, turned to Tomoka and gestured toward her stance.

"Your foot placement was incorrect."

Tomoka was too stunned to argue.

Sakuno bowed deeply. "T-Thank you for the correction, Tezuka-senpai!"

Tezuka nodded once, then—as if nothing had happened—walked away.

The regulars stood frozen in absolute shock.

Momoshiro turned to Fuji. "Did—did Buchou just… did he just…"

Fuji nodded, eyes glinting. "Yes. And he was good at it."

Eiji was shaking. "Tezuka is… a ONCE?!"

Kaidoh hissed. "This isn't real."

Oishi, still processing, muttered, "I think I need to sit down."

Meanwhile, hidden in the distance, Atobe Keigo was watching through opera glasses.

He snapped his fan shut.

"Unacceptable. I refuse to be outdone."

The next day, Hyoutei held a full-scale TWICE dance practice.