The school bell rang.
Mishima Prefectural High was abuzz with whispers.
"Did you hear? A new transfer student—absolutely gorgeous."
"Rumor is she came from overseas… and the principal bowed to her!"
In Class 2-B, Tachibana sat at her desk, still recovering from the events of the night before. Her fever had faded, but her mood had not. She scowled at the classroom door, biting her lip.
"Where is that idiot? Skipping school after all that? Coward."
But before her thoughts could finish, the door slid open.
Clack.
Every head turned. And every jaw dropped.
A girl walked in, her heels clicking like a slow countdown to disaster. She wore the Mishima uniform… or at least a version of it. Her crimson necktie was undone, her black skirt was criminally short, and her shirt clung like a second skin.
Rosaria Vermielle.
"Good morning, classmates," she purred, brushing a hand through her black velvet hair. "Please take care of me."
Tachibana stood up so fast her desk toppled over. "YOU!?"
Rosaria winked. "Oh, dear cousin. You didn't tell them we were related?"
"Like hell I would!"
The class watched in stunned silence as the new girl sauntered over and plopped down in the seat next to Tachibana.
"I requested the seat specially," Rosaria whispered. "Wanted to be close to my favorite niece."
Tachibana's eye twitched. "We're the same age, you crazy blood bag."
Meanwhile…
At the Mishima 24-Hour Mart
Machio sighed, wiping down the counter. The convenience store was dead quiet.
"First vampires, now cousin vampire girls... What next? Succubus homeroom teachers?"
A bell jingled. Kira walked in, flipping his blazer like a cape.
"Yo, my future son."
Machio dropped the cleaning rag. "Please stop calling me that."
Kira leaned on the counter. "We need to talk. You've become the center of something big. The Crimson Pact wasn't just broken—it was rewritten."
Machio blinked. "What does that mean?"
Kira looked around, making sure no one was nearby. "It means you're now the 'Heir Anchor'—a human bonded to two royal vampire bloodlines. If either side claims you fully, they gain the right to rule the Vampire Congress."
"…And if I don't choose?"
Kira smirked. "Then both sides will try to seduce, kidnap, or kill you."
Machio facepalmed. "Why me?"
"Because," Kira said, "you've got potential. And that little pervert system of yours? It's ancient magic. It's choosing you as some kind of chaos catalyst."
Back at school…
Tachibana was fuming. Rosaria hadn't stopped talking. Or… teasing.
"Oops," Rosaria said, bending over to tie her shoe—for the fifth time, giving every boy a full view.
"YOU'RE DOING IT ON PURPOSE!" Tachibana shouted.
"Oh? Jealous?" Rosaria licked her lip. "Maybe you should show them your assets too."
That was it.
Tachibana leapt onto her desk.
"Everyone out! PE Room! Right now! We're settling this with a BUTT BATTLE!"
The class screamed in confusion and excitement.
Scene Cut: The PE Room.
Tachibana stood in the middle of the floor, her gym bloomers tight. Rosaria stood opposite her, smirking in her form-fitting shorts.
The rules were simple: butt vs butt. Last one standing wins.
"On my signal!" Anzu yelled, having arrived with Matsumi to watch the chaos. "Three! Two—"
Rosaria pounced early, swinging her hips like a deadly whip.
Tachibana countered with a spinning back-thrust, their cheeks colliding in a thunderous SLAP!
"GYAAH!"
Girls cheered. Boys cried. Phones recorded.
Meanwhile, Matsumi leaned next to Anzu. "This is ridiculous."
Anzu smiled. "This is life."
The battle raged. Rosaria had technique. Tachibana had fury. But both had jiggling, bouncing determination.
Then—
SLAP!
Tachibana landed a full-force backwards butt-kick, sending Rosaria flying into the crash mats.
"YESSSS!" Tachibana posed victoriously, sweating and panting.
Rosaria chuckled from the mat. "You've grown, cousin… but the game isn't over."
She stood, fixing her skirt. "Soon, the council will choose a side. And your little human pet? He'll have to choose too."
Back at the store, Machio stared at the system notification on his phone.
> [SYSTEM ALERT: Incoming Trouble Detected – Return to School Immediately.]
He sighed. "Can't even finish a shift…"
To be continued.