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[Host, Interdimensional Energy has reached 100%. Open interdimensional gate to return to original world?]
[YES / NO]
Standing in the courtyard, Kaido gazed at the virtual screen's options. He smiled serenely.
[NO.]
[Understood. Storing Interdimensional Energy for future contingencies.]
[System, aren't you going to ask why?]
[This system will unconditionally support Host's choices without interference.]
[Thank you, System.]
[You're welcome. Additionally, please name this system. Henceforth, this system will serve Host permanently.]
[You won't leave me?]
[Never.]
Hearing those words, warmth flooded Kaido's heart. Without the System, he might never have survived in this world—never met his companions or the woman he loved.
[In that case, your name is "Mirai."]
[Acknowledged. System renamed: Mirai.]
[Host, Mirai System will serve you. Please treat me well.]
[Mirai, please treat me well too.]
"Kaido-niisan, what are you doing?" Seeing Kaido standing motionless in the courtyard, Retsuki approached curiously.
"Retsuki, there's something I need to tell you."
Kaido's expression turned serious. Seeing him like this, Retsuki assumed something grave had occurred.
"Kaido-niisan, what's wrong? Did something happen?"
Taking a deep breath, Kaido spoke: "Retsuki, will you marry me? Build a life together, have children, grow old with me?"
"Kaido-niisan, didn't you ask me this before? I already answered—as long as you don't mind me, I'll do anything for you."
"No. This time I need to hear your real answer. I don't want you agreeing out of gratitude for my help. I want to hear you say—in your own words—that you want to marry me."
Hearing this, memories flooded Retsuki's mind. Every moment with Kaido this past year—countless precious memories.
Claiming she didn't love him would be impossible. But she'd been a Lower Moon demon, had harmed countless humans. Even after becoming human, those painful memories remained.
She'd feared Kaido only pitied her. But she'd been wrong. This past year, he'd shown nothing but genuine care—helping her start a new life, never judging her past.
Their relationship could be called siblings—but resembled lovers more.
When she'd heard of Kaido's death, that heart-wrenching agony remained vivid even now.
That's when she'd understood—she truly loved him. But fear of rejection had kept those words buried deep inside.
Now, hearing Kaido's confession, her composure shattered. She threw herself into his arms, sobbing.
Kaido held her close, one hand gently patting her back in comfort.
Eventually, Retsuki's tears subsided. Through tear-blurred eyes meeting his gaze, she finally spoke the words hidden in her heart: "Yes! Kaido-niisan, I want to marry you. I love you!"
Rising on tiptoes, arms encircling his neck, she kissed him—the first time she'd initiated such intimacy.
CRASH—
The courtyard quarters' wooden doors toppled forward. The Kocho sisters, Mitsuri, and Tengen's three wives tumbled together atop the fallen panels—witnessing the intimate moment. The atmosphere turned instantly awkward.
"Ara, what lovely weather today! Don't worry, Kaido-kun—we didn't see anything just now!"
The other women nodded vigorously, claiming they'd merely stopped by—saw nothing, witnessed nothing.
Absolutely didn't see the siblings kissing.
"KYAA!"
Realizing the situation, Retsuki's composure evaporated. Shrieking, she hid behind Kaido, hands covering her face—refusing to emerge.
Kaido stood frozen, hands uncertain where to rest, completely flustered.
"Continue! We'll come back later!" Kanae immediately stood, pulling her sister away. Makio's group fled likewise.
Leaving two thoroughly embarrassed individuals behind.
Kaido couldn't help laughing helplessly, turning to embrace Retsuki's shoulders. "They're gone."
Retsuki remained mortified. She'd finally gathered courage for that action—only to be caught red-handed.
"What's wrong? Who initiated things just now? Now you're all shy again?"
"Kaido-niisan, you're terrible! I'm not talking to you! Bleh~" Retsuki stuck out her tongue playfully, running back to her room without looking back.
Inside, she clutched her pillow rolling across the bed—face still flushed. Touching her cheeks—still burning hot.
"That was so embarrassing! Can't believe I did that!"
Recalling her boldness, heat flooded her face again. She dove under the covers, refusing to emerge.
"Kaido-niisan really wants to be with me... doesn't mind my past... I'm so happy!"
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After leaving Kaido's estate, the six women discussed what they'd witnessed.
Originally planning to invite Retsuki shopping, curiosity had driven them to peek through the door.
Seeing Retsuki actively kiss Kaido, excitement caused them to accidentally collapse the door—resulting in that awkward scene.
"Retsuki-chan was so brave! She found her other half—I'm genuinely happy for them. They'll definitely be happy together!" Mitsuri's eyes sparkled with stars, recalling the moment.
"Ara, never imagined Kaido-kun would actually confess to Retsuki-chan!"
"We should've arrived sooner—almost missed such a good show!"
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One Month Later
Time flowed like sand through an hourglass. This day brought the most important celebration—Obanai Iguro and Mitsuri Kanroji's wedding.
The first grand wedding in Demon Slayer Corps history. Though disbanded, the occasion brought everyone together. Kagaya had made clear all were always welcome.
Obanai invited Kagaya as officiant, along with every former comrade—including the entire Rengoku family.
He'd personally asked Kaido to be his best man, with Retsuki as bridesmaid.
Both accepted without hesitation.
That day, witnessed by countless companions, the newlyweds made their dazzling entrance.
Facing everyone's cheers, Obanai remained somewhat shy and reserved. But Mitsuri bloomed like a peach blossom—beaming radiantly, heart overflowing with happiness.
Under everyone's gaze, Obanai and Mitsuri walked forward hand-in-hand. Mitsuri carried a bouquet. Behind the newlyweds, best man Kaido and bridesmaid Retsuki appeared before the assembly.
Obanai wore the suit Kaido had prepared—looking genuinely handsome.
Mitsuri wore the white wedding dress Kaido had designed—with lace veil, small silver crown decoration, and exquisite styling. She looked absolutely celestial.
Witnessing the couple, everyone applauded—offering blessings.
Tengen praised enthusiastically: "Obanai, you look supremely flamboyant! Really suits you! Mitsuri, you're flamboyant and beautiful too! Congratulations!"
Others added their own blessings and celebrations.
"Obanai-san, congratulations on your marriage!" the three youngest girls chorused. Obanai blushed shyly, quickly thanking them.
They approached Mitsuri next, presenting a carefully handcrafted gift. Mitsuri embraced all three, expressing profound gratitude.
Everyone presented carefully selected gifts.
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