Mikasa?
From Attack on Titan? Or maybe Azur Lane?
White-haired ball Paramecium K423...
"Hiss... Why does that name sound so familiar?" Nanashi muttered, his eyelids twitching.
"Nanashi, is the tea too hot?" Kie asked, worried he might've burned his tongue.
Some people liked their tea hot, others preferred it warm—or even cold.
Assuming Nanashi liked it cooler, Kie hurriedly exhaled over the cup, trying to lower its temperature.
"It's a bit hot. Please cool it down a little more for me," he replied.
As he spoke, he held the ice cream cup with both hands and reached out to steady Nezuko, who was leaning dangerously off the edge of the sofa.
"Nezuko, if you're that scared, you don't have to keep watching. There are gentler magical girl shows. Want to change the channel?"
Though trembling, Nezuko shook her head stubbornly. "No, Brother Nanashi. I can handle it."
Seeing her determination, Nanashi didn't try to stop her. "Alright, then."
Truth be told, Nezuko was so scared she had an accident.
Nanashi held her close. He didn't mind his clothes getting dirty, but the floor getting wet would make cleanup harder for Sayuri.
Kie's tricolor cup, meanwhile, was crafted from a special material.
It followed a principle opposite to thermal expansion—it expanded when cold and contracted when warm.
This made it the perfect container for her ice cream.
The slower you ate it, the more it melted. And the more it melted, the better it tasted.
The melted juices of the three flavors combined into a rich and exquisite blend.
Anyone who had tasted it would know—this fusion of flavors was nothing short of heavenly.
Nanashi reached out and gently brushed aside the damp hair sticking to Kie's cheek.
He took another bite of the ice cream and murmured, "I just want to say—Kie's craftsmanship is amazing. This tricolor cup is delicious."
Kie's eyes sparkled with affection, warm as blooming hearts. "As long as you enjoy it."
Beaming with pride, she added, "If I get the chance, I'll make five-color cups, six-color cups… even more, just for you."
She had learned her skills from Sayuri.
Three-color cups were easy now—she could challenge herself to make even more elaborate flavors.
Nanashi's eyes lit up. "That sounds amazing!"
He didn't say another word.
Instead, he quietly returned to tasting the tricolor cup, while continuing to scroll through the lively chat messages.
White-haired Ball Paramecium K423: "Hello, hello! What kind of weird chat group is this? I can send messages just by thinking them!"
White-haired Ball Paramecium K423: "And what's with this weird nickname?"
Kiana: "Hi everyone! I'm Kiana Kaslana!"
Shinobu: "Ah, the new member seems very energetic."
Seitenshi: "This is the Doomsday Chat Group—a communication hub for people from different worlds facing doomsday crises."
Kiana: "Doomsday? I don't feel anything like that."
Kisara Tendo: "Check your personal status. It should be listed there."
Kiana: "Oh... 'Future Doomsday (6 stars)'. Is that it?"
Kiana: "What does that even mean?"
Kiana Kaslana. K423. That was more than enough to confirm her identity—Kiana from Honkai Impact 3rd.
Nanashi continued devouring his tricolor cup at an impressive speed while answering Kiana's questions.
Nanashi: "It means a potential doomsday in the world you live in."
Vivi: "That's right. I doubted it at first too, but once others joined, I realized it was all real."
Kiana: "The world's ending? Hah! I don't believe you. Who's playing a prank on me? Show yourself!"
At Senba Academy's high school division, Kiana suddenly slammed her desk and stood up in the middle of class, her expression brimming with righteous fury as if she had just uncovered a grand conspiracy.
"Who's teasing me? Show yourself right now!"
"..."
"..."
"..."
"..."
The entire class was startled by the sudden outburst.
The teacher at the front of the room, writing on the chalkboard, flinched as the chalk snapped in his hand.
Whipping around, he tossed the broken chalk piece straight at her.
"Hey, look out!" Kiana leaned back just in time to dodge it perfectly.
"…"
The teacher's face darkened. His voice dropped to a deadly whisper. "Kiana… my office. After class."
"…Yes, sir."
Only then did Kiana remember she was still in class. She slumped back into her seat, face full of regret—but her eyes immediately drifted away from the blackboard and back to the chat group.
Meanwhile, in a dense forest, a black-haired girl zipped through the trees using her ODM gear.
"What's this?"
A light screen appeared suddenly in front of her, disrupting her vision.
Thrown off course, her grapples missed the mark.
"Ugh!"
Mikasa hit the ground hard.
She instinctively rolled with the fall, minimizing the impact. Fortunately, the height wasn't too great—aside from what felt like a dislocated arm, she wasn't seriously injured.
"Tsk. Careless even during reconnaissance?"
Another black-haired girl descended nearby, her tone biting and sharp.
Mikasa glanced at her without responding, silently walking over to a nearby tree and sitting down, cradling her arm.
"Ymir, don't be so harsh," said a golden-haired girl, approaching gently. "Mikasa might've just gotten distracted."
"I'm just saying this for her own good," Ymir replied, softening slightly as she looked at the blonde. "If you lose focus when facing Titans, you die."
Ymir noticed Mikasa looking straight ahead. Assuming she was being stared at, Ymir narrowed her eyes in return.
But Mikasa wasn't looking at her at all. Her eyes were fixed on the floating screen in front of her.
Kiana: "Why can't anyone else see this weird screen?"
Tushan Honghong: "Because it's the Doomsday Chat Group."
Momonga: "Exactly."
Kiana: "???"
Kiana: "That's not helpful!"
Mikasa: "'Uncertain Doomsday (Level 4)'… Is that what this means?"
March 7th: "Another Uncertain Doomsday, huh?"
Nanashi raised an eyebrow, intrigued. He grew curious about this newcomer named Mikasa.
Unknown: "Mikasa, what's your full name?"
Lemuel: "Huh? Nanashi's interested in the new girl?"
Nanashi: "Just asking. You don't have to answer if you're not comfortable."
Mikasa: "Mikasa. Mikasa Ackerman."
Confirmed—Attack on Titan's Mikasa.
Just to be sure, Nanashi asked one more question.
Unknown: "Who is Eren?"
Mikasa: "Eren? Eren who?"
"???"
Nanashi blinked rapidly, doubting his eyes.
Mikasa Ackerman didn't know Eren?
In the original story, she was adopted by Eren's father.
Could this be a version of Mikasa before that happened?
Nanashi: "How old are you?"
Mikasa: "Fifteen."
"???"
Nanashi was thoroughly confused and even paused mid-bite from his tricolor cup.
Feeling the curious stares from the others in the room, he quickly resumed eating, trying not to show his bewilderment.
But his thoughts ran wild.
At 15, she should've already joined the Survey Corps. How could she not know Eren?
Maybe this world is different. Or maybe… it's the uncertainty of the doomsday that changed her fate.
Kiana: "Hey, hey, hey! Can someone please explain what's going on?"
Aqua: "Guhehe~! Join the Axis Church and I'll tell you!"
Kiana: "Do I look stupid to you? 'Axis Church'? That name sounds shady as hell!"
Nanashi: "You should explore the group features first. Try to verify for yourself whether this is real or not."
Kiana: "Hehe, I saw something called a red envelope function. It says you can send stuff to others."
Kiana: "Hey, if you guys are really from other worlds, would my stuff even transfer properly?"
Saeko: "The red envelope function allows exactly that."
[Ding! Kiana has sent an exclusive red envelope to Nanashi!]
"…?"
Nanashi looked puzzled. What kind of red envelope did she send me?
[You have received a red envelope from Kiana. Would you like to open it?]
He retrieved the item from the chat group's spatial interface.
And then… he stared at it in silence.
It was a homework book.
With Kiana's name scribbled right across the cover.
Nanashi didn't stop moving. Holding Nezuko gently by the arms, he flipped open the homework book behind her back.
The handwriting was surprisingly neat.
But it was clear she hadn't been focusing on the class. Little doodles of animals were scattered throughout the pages—proof of a distracted mind.
He glanced at the group chat.
Kiana: "Oh no! My homework book disappeared! Hahaha! I don't have to do homework now! This chat group is amazing!"
Lemuel: "Are you sure that's a good thing? Your teacher might just make you redo it from scratch."
Kiana: "Huh? They can do that?!"
Silver Wolf: "Isn't that the normal reaction? Why didn't you think of that?"
Kiana: "What?! Nooo! I already finished half of it! Nanashi, give it back!!"
Nanashi: "…"
As expected from the ever-clueless Kiana.
Silver Wolf: "…"
Bronya: "…"
Nami: "Suddenly, I think this new member would be a perfect fit for the Axis Cult."
At one point, Nanashi had explained to the group just how terrifying the Axis Cult could be.
Aqua didn't take too kindly to that. She protested furiously, but in the end, she was no match for the persuasive powers of the "Authority Dog."
Back in the real world, Nanashi supported Nezuko with one arm and returned the homework book.
[Ding! Nanashi has sent an exclusive red envelope to Kiana!]
[Kiana has received the red envelope!]
Kiana: "It's back! My homework book really came back!"
Kiana: "Wait… why is it wet?!"
Nanashi: "I, uh… dropped it. Tea spilled on it by accident."
I'm sorry, Kiana. I lied. But it was for your own good.
Kiana: "Oh… okay. I'll just let it dry for a bit."
Mikasa: "What exactly is the Uncertain Doomsday?"
Nanashi: "It's something... you'll have to face on your own."
And with that cryptic message, Nanashi ghosted the conversation.
The ice cream was starting to melt, after all.
And the three-color cup was best enjoyed at that perfect moment—just before it turned into a puddle of sugar soup.
Especially in winter.
Ice cream in winter… anyone who's tried it knows.