Honkai Academy.
Bedroom.
"Bronya, Sirin, this child is Musashi—she's your new little sister."
"She doesn't understand much yet, so you two need to take good care of her, alright?"
Kiana Kaslana gently pushed the silver-haired, red-eyed girl hiding behind her to the front.
Musashi had been brought back from the Arpeggio of Blue Steel world. After cleansing her of corrupted memory data, Kiana had kept her close for a while, observing her carefully. Once she confirmed there was no problem, she finally introduced her to her two daughters.
"Alright, Mom."
Bronya, dressed in her blue-and-white Herrscher attire, placed her right hand on her full, prominent chest and promised seriously, "My sister and I will take good care of Musashi."
Neither of the girls seemed concerned about where this new sister came from.
After all, they themselves had been brought home in much the same way.
Kiana Kaslana turned to look at the distracted Sirin.
At the moment, Sirin was wearing her purple-and-white Herrscher dress, lying lazily on the bed. Her exquisite legs wrapped in white silk stockings swayed rhythmically in the air, her delicate feet crossing and uncrossing in a slow, playful motion.
Kiana teleported behind her with Musashi in her arms and sat down on Sirin's slender waist.
"Sirin, be a good girl and greet your new sister," Kiana said, gently pinching Sirin's cheek.
"I know, I know! I'm busy handling stuff in another world right now!" Sirin said impatiently, brushing her mother's hand away.
Another sister? Seriously?!
How many more little sisters am I supposed to have in the future?!
She looked at the silver-haired, red-eyed girl now kneeling obediently in front of her.
Musashi's crimson eyes blinked with curiosity.
At first glance, Sirin found this new sister rather likable.
Unlike Bronya—whose first meeting had left her feeling uncomfortable.
Though, after spending so much time together, that feeling had faded.
Still, the two of them often bickered and argued over small things.
"Mom, you're heavy," Sirin grumbled, twisting her body beneath Kiana.
"M-Mother…"
Kiana froze.
Though it was just a different way her daughter addressed her, it still hit her pride a little.
Unable to help herself, Kiana gave Sirin's bottom a light smack.
"What are you doing?!"
"Don't call me 'Mother.' Just call me Mom."
"It's the same, though..." Sirin muttered under her breath.
"Alright, you girls have a good chat. I've got other things to do," Kiana said, standing up. She patted Musashi's head and gave her a few words of encouragement before leaving.
Not human…
Sirin studied the girl carefully and asked, "You're Musashi, right? From now on, you'll be living here. If you need anything, just come to me or Bronya."
Musashi nodded slightly, her voice soft. "Thank you, Sister."
So polite!
Hearing that gentle 'sister,' Sirin couldn't help but smile. She stood up and reached out to pat Musashi's head. Musashi didn't resist—in fact, she closed her eyes and smiled happily, enjoying the gentle touch.
Wow, this kid is really cute—so much better than Bronya was as a child.
At that moment, Bronya walked over, took Musashi's hand, and smiled. "Come on, Musashi, I'll show you your room."
Musashi followed Bronya out of the room. Watching their backs, Sirin suddenly felt a faint pang of loneliness. She shook her head quickly, trying to brush off the strange feeling.
...
Highschool of the Dead World.
Toy Factory.
Command Room.
Sirin turned to look at Bronya, who was sitting on the sofa, lost in thought. Their bodies in this world were made of nanomaterial, remotely controlled by their consciousness.
Her gaze unintentionally fell on Bronya's chest.
Noticing Sirin's stare, Bronya lifted her head and met her eyes.
Sirin quickly looked away.
Damn it!
Why do my eyes always end up there?!
That's definitely not my fault!
"Zofia," Sirin called out.
"Yes, Lady Sirin, I'm here."
Zofia, who was standing guard outside the door, immediately walked in when she heard Sirin's voice.
She came to stand beside Sirin.
"Keep your eyes on her," Sirin said, pointing at Bronya sitting on the sofa.
"Yes, my Lady."
Zofia didn't quite understand what this was about, but she followed the order obediently.
Her gaze locked onto Bronya, who was sitting with a playful smile on her face.
Zofia's eyes darted around uncertainly for a while, unsure where to look.
Eventually, her gaze settled on one particular place.
Lady Bronya's… they're huge!
"Isn't she big?"
"She's really big."
Zofia answered without thinking.
Then she covered her mouth, lowering her head in embarrassment.
Would Lady Bronya be angry about that?!
She snuck a nervous glance at Bronya, still sitting calmly on the sofa.
"Get out."
"Yes!"
Zofia hurriedly ran out.
As expected!
Sirin understood now—it wasn't her fault!
Anyone who looked at Bronya would naturally be drawn to that part of her.
She used to be a flat little duckling, but now she had a figure as full as Mom's.
"Why do you care so much about my chest, sister? If you want to change, can't you just do it yourself?"
Bronya truly didn't understand.
She had grown naturally into her current form.
Now that her body had stabilized and transcended human limits, it would no longer age or change.
"I don't care!" Sirin snapped back, quickly changing the subject. "Have you decided what to do with this world?"
The humans of this world hated them deeply.
The zombie crisis wasn't their fault.
But their sudden appearance had made them the perfect scapegoats.
Even if they took control of the world, countless people would still plot against them in secret.
"Do you have a plan?" Bronya asked.
"My plan is to keep a few and kill the rest."
Sirin's voice was calm. What they wanted was the world—the universe itself. Civilization meant nothing to them.
Most of this world's population had already turned into zombies. Those who survived were mostly depraved, lawless beings who'd abandoned their humanity. Keeping them would only cause trouble.
Bronya fell silent. Her mission was to seize and control this world—not to save its civilization. Even if humanity here went extinct, the mission would still be considered accomplished.
Their mother didn't care about preserving civilizations.
She only cared about certain individuals within them.
"I'll just let the others handle it."
Bronya decided to leave the problem to the Stigmata users currently training in this world.
"You came to this world with me, but you haven't really done anything serious, have you?"
"Sister, do you know what makes a good leader?"
A sly glint flashed in Bronya's eyes.
"...?"
"A good leader delegates everything they can't—or don't want to—do to others. If it succeeds, it means you led well. If it fails, it's their fault."