The 8:00 AM sun came through the high arched windows of the hotel's War Room, casting long shadows across the debris of the night.
Empty aluminum cans of energy drinks stood on every surface, and the air was a thick stale mix of floor wax, lukewarm coffee, and the electric hum of fifty overworked laptops.
Makoto sat at his station, his fingers hovering over the mechanical keyboard. On the screen, the final build of the Family Module prototype was compiling. The progress bar moved slowly, 92%… 94%…
Beside him, Yui was slumped in her chair, her glasses lopsided on her face. Her eyes rimmed with red, her earlier boldness replaced by quiet exhaustion. She was meticulously adjusting the color hex codes for the interface, her movements precise but lacking the energy they had possessed just hours before.
The rejection last night still hung between them like a glass wall, transparent yet undeniable.
"Build complete," Makoto whispered, the words sounding like a prayer.
Yui sat up, rubbing her face. "Is it stable yet, Makoto-san? Did we fix the crash when showing three waifus at the same time?"
"Stable as it'll ever be, Yui, all thanks to your help," Makoto said, his voice rough. He reached out, trying to pat her shoulder, but his hand hesitated for a fraction of a second.
Yui leaned back, her chair creaking in the quiet room. "I'm sorry about last night. I think the free wine and the deadline stress got to me. I was being a bit much."
Makoto finally turned to look at her. The neon pink light of the lounge caught the lines of his shirt, which was now wrinkled beyond repair. "It's okay, Yui-san. It's been a long month for both of us. You've been a great partner. I wouldn't have survived the UI requirements without you."
Yui looked at him for a long moment, then nodded, a silent acceptance of the boundaries he had drawn. "We make a good team. Let's just win this thing, okay! Ready for the demo?" She asked and reached out, her hand hovering near his arm, before she pulled it back, remembering his choice from the night before.
"Ready as you are. Let's do it," Makoto said.
===
It's 11 AM, time for the teams to demo what they have worked on for the last 24 hours. The auditorium was a wash of cool blue light, with the low, expectant murmur of the Clitify leadership team and a handful of early-stage investors.
In the front row sat Kenta, looking sharp in a clean hoodie, and Kyosuke, who was in a proper suit now, already tapping a stylus against his chin.
Makoto stood at the podium, his heart hammering against his ribs. He felt the sweat slicking his palms as he looked out at the suits in the audience. These were the people who decided if he was a professional or just a degenerate.
"Go ahead, Makoto-kun," Kenta called out, his grin encouraging. "Show them the soul of the machine."
Makoto hit the key. The massive screen behind him flickered to life, displaying a high-fidelity 3D avatar of two girls: one sharp-featured and scowling, the other soft-featured and quiet, watchful.
"This is our prototype of the Family Edition module," Makoto began, his voice gaining strength as he spoke. "Most AI companion just focuses on immediate gratification, acting like the user's ideal girlfriend. But this engine is built on different logic: Family and Care!"
He ran through the live demo. First, he showed how the bots analyzed the user's typing speed and syntax to detect signs of burnout.
On the screen, the bots noticed the user kept making typos and immediately took action: The timid girl dimmed the interface and suggested a break, while the angry girl complained about the user's computer time, but automatically added Ginger Tea and bento to a virtual grocery list.
"Our company builds AI companions, not just talking chatbots," Yui added, stepping up beside him, her voice professional and crisp. "This module will help those waifus become users' daily partners, handling the invisible labor that often leads to modern stress."
The Product Manager, Kyousuke, leaned forward. "Impressive! The girls seem to interact with each other, too."
"That's because it's not just a script," Makoto explained, his mind flashing to Mafuyu. "We build a persistent emotional profile for each bot after each interaction, so she remembers."
Makoto chuckled as his voice got more confident, "If you're a jerk to her on Monday, she won't just forget it on Tuesday. If another girl in the family helped her, she would find a way to repay the favor next time. She has a memory that influences her care levels."
The demo ended with the calm girl softly saying, "You've worked hard today, darling. I've scheduled your morning alarm ten minutes later so you can catch up on sleep."
The silence in the room stretched for five long agonizing seconds. Then, Hiro, the Lead Designer, started to clap, slowly at first, then with genuine enthusiasm. "Incredible," He muttered, standing up. "We can mix and match existing AI archetypes to create unlimited families. Users are going to lose their minds."
Tokuya, the senior engineer who was Makoto's onboarding buddy, jumped up and punched the air. "I KNEW IT! Rookie, you magnificent bastard, I know you can do it!"
Makoto felt a wave of relief so intense it made his knees weak. He looked at Yui, who was smiling, though there was lingering sadness in her eyes.
"Good job, senpai," she whispered.
===
By Saturday afternoon, the hackathon was officially over. The networking mixer was beginning in the hotel's rooftop bar. It was an open-bar event that was supposed to be the highlight of the retreat.
"You're not staying, Makoto?" Kenta asked, catching Makoto as he moved toward the elevators with his bag already packed.
"I can't, Kenta-san," Makoto said, his hand already reaching for the G button. "The demo is done. I need to get home."
Kenta barked a laugh, slapping him on the back. "Your family again? You're a rare breed, Rookie. Most guys would kill for a night of free gin and a hotel bed. But I guess when you've got what you've got waiting for you, so… yeah."
With a smirk, Kyosuke slapped Makoto's shoulder and said, "The investors are already asking me for a roadmap of that Family Module. You're a legend, Makoto! See you Monday."
===
Makoto stopped at a small boutique near the station. With 36,000 yen left in his fun budget, he spent it all on gifts: a high-end knife with an ergonomic wooden handle for Yuna, a box of luxury cooling bath bombs for Mika, a bottle of limited-edition lavender essential oil for Ayane, and a silk scarf for Mafuyu.
He finally reached home at 11 PM. The apartment was silent; it smelled of citrus cleaner and leftover curry, and the heavy, sweet scent of scented candles.
He walked up the stairs to the apartment, his feet feeling light despite the exhaustion. He slid his key into the lock, the metal clicking home with a soft final thud.
"I'm home," he whispered, stepping into the dark entryway.
Makoto walked into the living room and stopped, his breath catching in his throat.
The low coffee table had been pushed aside, and the floor was covered in a sprawling nest of every pillow, duvet, and blanket in the house. In the center of the nest, his wives were piled together.
Yuna was in the middle, her face buried in a cushion, her hand still clutching a bag of sour gummies. Ayane was draped over her legs, her mouth slightly open, a soft rhythmic snore escaping her.
Mika was sitting partially upright against the sofa, her head tilted to the side, her eyes closed. A tablet resting face-down in her lap. And Mafuyu was curled up against Mika's side, her hand resting over her stomach, a peaceful smile on her lips.
Makoto stood there for a long time, just watching them. He thought about how quiet the house had been when he left, and how they had all gathered here, in the center of their world, to wait for him.
"They were so worried they couldn't even sleep in their own beds," Makoto thought, his heart swelling with a love that felt large for his chest. "They built a fort just to stay close to each other while I was gone."
He didn't notice the faintly pulsing light from Mika's tablet, nor his GPS history, nor the audio logs currently being uploaded to Mika's secure cloud. He didn't see the Remote Alarm button that would have woken up his whole company if he had taken one step into Room 1204.
To him, they were just his wives, beautiful and exhausted.
Makoto gently grabbed the oversized duvet that had fallen to the side. He unfurled it carefully, spreading it over the entire pile of women. He leaned down, pressing a soft kiss to Yuna's temple. She mumbled something that sounded like "Pudding… pig…" and snuggled deeper into the pillow.
He kissed Ayane's forehead, Mafuyu's cheek, and finally, Mika's nose. Mika's eyelids flickered for a second, but she didn't open them. She simply let out a long contented sigh and leaned her head more firmly against the sofa.
Makoto walked into the couch, his heart full. He felt a clarity he hadn't known his entire life. Corporate success, the Family Module, and investor interests were all just noise. This was his signal: this room, the nest of his family.
He put his head down to rest, intending to just rest for a minute, but he stayed and watched them for a long time: the way Yuna's nose wrinkled in her sleep, the way Mika's hand would occasionally twitch, reaching for a phantom keyboard.
Makoto felt like a proper husband (even though they haven't married) now. "I wouldn't trade this for anything," he thought, his eyes growing heavy. "Not for any cute colleague, or for all the sake in Shibuya."
He drifted off right there, his hand resting on the edge of the blanket.