How Is Vim Fitness Integrated Into Isekai Novel Plots?

When the apocalypse came, she lost everything. Starving, hunted, and desperate, she trusted the one man she loved… only for him to betray her in the cruelest way possible. He stole her last supplies to please another woman and left her to die in a sea of the undead. But death wasn’t the end. She woke up days before the world collapsed. After cutting ties with her ungrateful ex and his parasitic family, a mysterious voice awakens in her mind, LUS, a Level-Up System designed to help her survive the coming end. With knowledge of the future and a system guiding her every move, she begins to prepare. She stockpiles resources, builds a base, and learns how to fight back against the horrors that once destroyed her. And when the apocalypse arrives again… she’s ready. But survival isn’t the only thing waiting for her in this new life. A silent killer who watches her like prey. A manipulative genius who wants to unravel her secrets. A gentle protector who sees the girl she hides. And a dangerous man who thrives in chaos. As the world burns and power shifts, they’re all drawn to her, each with their own motives, each with their own darkness. Even her past refuses to stay buried. Because now, the man who once abandoned her is back, broken, desperate, and begging for a second chance. Too bad she has no time for regrets. Not when she’s busy rising to power… and building a kingdom in the ruins of the world.

I woke up inside a novel, and not even as an important character. I became a pretty background extra in a smut novel. My brother, however, was the only normal person in the entire story. His character setting was the one man the soft, delicate heroine could never win over. He was the cold, unattainable Prince Charming she could never conquer. When the heroine cried and confessed her love, he was studying. When she offered him her whole heart and body, he was busy starting a company. When she spiraled into scandals and nightlife, he was already a billionaire, calm and untouchable. I thought he would live a quiet, ascetic life forever. Until one night, I walked in on him at midnight… holding a piece of clothing I recognized all too well, murmuring a name over and over, a name so familiar that my scalp tingled.

Evy was a simple-minded girl. If there's work she's there. Evy is a known workaholic. She works day and night, dedicating each of her waking hours to her jobs and making sure that she reaches the deadline. On the day of her birthday, her body gave up and she died alone from exhaustion. Upon receiving the chance of a new life, she was reincarnated as the daughter of the Duke of Polvaros and acquired the prose of living a comfortable life ahead of her. Only she doesn't want that. She wants to work. Even if it's being a maid, a hired killer, or an adventurer. She will do it. The only thing wrong with Evy is that she has no concept of reincarnation or being isekaid. In her head, she was kidnapped to a faraway land… stranded in a place far away from Japan. So she has to learn things as she goes with as little knowledge as anyone else. Having no sense of ever knowing that she was living in fantasy nor knowing the destruction that lies ahead in the future. Evy will do her best to live the life she wanted and surprise a couple of people on the way. Unbeknownst to her, all her actions will make a ripple. Whether they be for the better or worse.... Evy has no clue.

Blaire was out on a cruise with her family for the first time. However, due to a certain circumstance, the moment she opened her eyes, she arrived in the world of novel as Victoria Nightingale, the Forgotten Princess of the Kristania Empire. In order for Blaire to go back to her world, she must fulfill the conditions Victoria set before her: Win her father's love and make herself as the Empress. As a side character, it is completely impossible to change the flow of the story unless she becomes a villainess who breaks her miserable and cruel fate. Upon meeting the 2nd Male Lead of the novel, an idea crossed her mind. "If you agree to the contract, I will become your temporary wife and together, we will kill the Emperor!" Will Blaire succeed and be able to go back to her world?

Awakening to a bewildering and astonishing reality, Seraphina found herself in an extraordinary situation: she had transmigrated into her own novel, stepping into the shoes of a character she had meticulously crafted. The male lead in her story was notoriously elusive, challenging to approach, and the master of a harem. Seraphina, now Zephyrine Everlynn, unexpectedly found herself among the women in his harem. It was utterly absurd! Promptly leaving the harem, Seraphina used her knowledge to help others win the male lead's heart, all for the right price. But why did the male lead continuously find his way back to her?

After transmigrating into a BL novel, she expects to become a forgotten side character and survive until the ending. Instead, she awakens as an SSS-rank Omega Guide, a rare Guide capable of calming dangerous Sentinels in the fantasy world of Elarion. Knowing the original story, she understands one thing clearly: she must stay away from the five powerful men destined to become the central figures of the novel—the cold Northern Duke, the ruthless Crown Prince, the obsessive Grand Magister, the dangerous wanderer of the Forbidden Forest, and the Forbidden Saint. They are not supposed to fall for her. Yet fate begins bringing them together. She meets each man in a different corner of Elarion, while every encounter slowly changes fate. What begins as curiosity gradually becomes attraction, protection, jealousy, and dangerous obsession. Determined to remain independent, she travels through enchanted kingdoms, ancient ruins, forbidden forests, magical academies, and lands ruled by terrifying creatures while uncovering the truth behind her Guide abilities. But something is wrong. The events she remembers from the novel are changing. Characters destined to die survive. People who were supposed to live disappear. The system guiding her begins hiding information, and the five men seem to know more about her. Then, the most mysterious of them all looks at her and whispers, “You finally came back.” She has never met him before. So why does he remember her? As secrets surface and ancient magic awakens, she discovers that the BL novel may never have been fiction. Her transmigration, the five men, her powers, and the system are connected by a secret capable of destroying the world. Now she must choose between following the destiny written for her or rewriting the story—even if it means becoming the obsession of five men who refuse to let her go.