Marinette lay on her deathbed in the Guardian Temple. She was no longer the 13-year-old girl she once was, to whom Master Fu had entrusted the Ladybug Miraculous, but an ancient woman, one who is on the verge of death.
After Marinette and her Court of Miracles defeated Hawkmoth and the new Hawkmoth Cerise and completed the Miraculous, she retired as Ladybug, but that didn't mean she had ceased to be a Guardian.
After achieving her lifelong dream and becoming a world-famous fashion designer, traveling the world and experiencing and tasting all sorts of things, she went to the Guardian Temple after several decades to train to become a better Guardian. The years passed, and she reached the highest rank as a Guardian and began training others in turn. She did this for almost three hundred years.
Now she lay on her deathbed surrounded by her grieving students, other Guardians, and the Kwamis.
Despite the pain she feels, Marinette says with a broad smile, "How can I rest in peace if you all mourn for me?"
Everyone around her couldn't help but continue crying and saying how much they love and respect her.
Tikki landed gently beside Marinette's head, her small form trembling as tears welled up in her eyes. "I'm really going to miss you," she whispered softly, her voice choked with emotion. "You will always be my best Bug."
Marinette smiled warmly, reaching out with a trembling hand to touch Tikki's face. "The day we met… I will never forget it. That was the day my life changed forever." She paused, her eyes shining with deep affection. "I love you very much, Tikki. And I hope your next Bug will love you just as much as I did."
Tikki wiped away her tears, her voice still heavy with sorrow but steady. "At least I will find comfort in knowing that you will be reborn into a better world."
Marinette didn't have the chance to ask what Tikki meant by that. Slowly, her eyelids grew heavy. With one last peaceful breath, she closed her eyes and exhaled for the final time.
But then, in the very next moment, Marinette's eyes fluttered open again. She found herself awake as a baby, nestled safely in a cradle.
A beautiful woman looked down at her from above, she had black hair, black eyes, wore a red elegante dress. Her face lighting up with joy. "Honey, Momo has opened her eyes!" she called out.
A man quickly hurried over to the cradle and gazed down at the baby. He had dark brown hair, black eyes, wore glasses and an elegant tuxedo.
Marinette didn't understand what was happening. One moment she had been lying on her deathbed surrounded by her students, and the next, she was a baby, surrounded by two strangers.
The woman gently lifted her from the cradle and held her close. With a joyful expression, she said, "Hello, Momo. I'm your mother, Misaki." Then she turned the baby toward the man beside her and said, "And this is your father, Kengo."
Marinette slowly opened and closed her eyes, trying to make sense of her situation. From the words her new parents spoke, she realized they were speaking Japanese. Fortunately, in her previous life, she had learned the language from her friend Kagami and had among other languages continued studying it during her travels.
As Marinette looked around the room, she noticed the lavish furnishings, which likely meant that these two strangers were wealthy. Finally, she spotted a mirror hanging on the wall and saw her new reflection. She looked like a newborn, barely a week old, but she recognized the resemblance to the woman holding her.
Her eyes widened as she finally understood what Tikki had meant with her last words. Marinette realized she had been reborn, but where exactly, she could not yet tell.
When the woman gently placed her back into the cradle, Marinette, after long contemplation, made a quiet decision in her mind, she would try to shape and enjoy this new life. Perhaps this would be a world where she didn't have to be a superhero.
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5 days later.
Five days have passed since Marinette was reborn as a baby named Momo Yaoyorozu, and she is gradually beginning to accept her new reality. However, since she has retained her previous memories and knowledge, she has set herself the goal of understanding the world as best as she can, as she is unsure of which era she was reborn in, and especially whether she still lives in her original world or in another world.
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5 Months later.
Marinette, or rather Momo, as she gradually began to accept her new name, has learned quite a bit in the past weeks and months since she was reborn, especially after gaining access to a computer, while her parents and maids were sleeping.
First, she learned that her new family is a very wealthy one. Their fortune is at least as large as if they had the Agreste fortune combined with the Tsurugi fortune.
The next thing she learned was that she might not be living in her old world, but in a different, yet similar world. There were still the same countries, the same cities, the same history. The only thing different from her old world is that she couldn't find anything about Ladybug or the Miraculous. What she did learn, however, is that more than 80% of humanity possesses a special ability called "quirk." Momo would consider this a figment of their imagination if she hadn't already seen her parents and some of her maids using their "quirk."
She also learned that there are plenty of heroes in the world, and not only that, but there are even special schools like UA that teach students how to become superheroes.
When Momo learned this, she secretly hoped she was one of those people born "quirkless," but honestly, it would be interesting to see what kind of "quirk" she would possess.
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4 years later.
It seems Momo wasn't as lucky as she had hoped. At the age of four, she was playing with a matryoshka doll in her room when her "quirk" manifested. She was able to create a matryoshka doll from the lipids of her body. Momo was so excited by what happened that she tried it again. After creating a few more matryoshkas, her mother saw it and frantically ran to her husband, shouting, "Honey! It's Momo! She's a genius!"
This wasn't the first time her parents or the servants had called Momo a genius. They had caught her reading books, unlike other children her age. Or drawing highly detailed pictures of places Momo should never have seen, or designs. Or even starting to walk at the tender age of zero.
But if Misaki knew what would happen the moment she called for her husband, maybe she would have reconsidered calling him. The day her parents witnessed Momo using her "quirk," her father stopped being the loving and caring father and husband he was. He practically planned her entire life. He uses her "quirk" for his own benefit. He had decided for her that she would become a superhero, something that Momo actually didn't want to be again.
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10 years Later.
Momo was 14 years old and in her final year of high school. She is expected to be accepted into UA next year.
Even though Momo would rather not be a hero, she recognized the advantages that a Hero License can offer. For example, with a Hero License, she can open her own agency and design and tailor hero clothes. Without a license, she couldn't do such a thing. She could design clothes for normal people, but not heroes. Because all the heroes she's seen so far wear pretty ridiculous costumes, she wants to open her own agency and design the clothes. She even has several sketchbooks with costume designs for heroes with matching "Quirks." Like for heroes who can change their form, make themselves invisible or even for people like her who can create stuffs from their body.
Aside from her plans for her own agency, she has learned remarkable things about her "Quirk" over the years.
Not only does she have the ability to create things, she has also discovered that she has other abilities. Abilities that are very close to the powers of all Miraculouses.
Momo has also been secretly practicing her new abilities and was more than confused as to why she possessed the powers of all the Kwami, as well as the powers she gained from power-ups, such as breathing underwater.
Momo decided to keep these powers secret for the time being, even from her own family, as she doesn't know how they will react when they find out about her new abilities. Especially since her father already exploits her "Creation quirks."
Momo looks out the window during class, hoping that everything will turn out well once she begins UA.