Undertale Nightmare Novels & Stories

On her eighteenth birthday, Maria Eduarda’s life is shattered by a nightmare she never saw coming. Broken, terrified, and drowning in pain, she believes there is no reason left to live. But fate has other plans. Leon Vitorino, a powerful and dangerously possessive CEO, has everything money can buy—except the one thing he never believed in: love at first sight. Until he sees her. Drawn to her sadness and determined to protect her at all costs, Leon steps into Maria’s life like a storm—intense, controlling, and impossible to ignore. But can a man used to power and control truly heal a woman who has lost herself to trauma? As secrets unfold and past wounds resurface, Maria must decide: will she keep running from her pain, or risk everything to trust the man who refuses to let her go? In a story filled with passion, darkness, and redemption, can love really conquer pain… or will it destroy them both?

One life for another. That is the rule of the Aftergame. Lena was a ghostwriter who lived in the shadows—until a devastating betrayal by her sister pushed her into the path of a speeding truck. She expected the void. Instead, she woke up in a sadistic, system-driven purgatory where the dead must compete for a second chance at life. In this gore-soaked nightmare, survival has a name: Riven. A lethal player with eyes like cold flint, Riven breaks the game’s cardinal rule to save Lena, making them both targets of the system’s wrath. But as they reach the final level, the horrific truth unvails. Riven isn’t a player. He is the Executioner—a sentient program designed to mimic love, only to deliver the ultimate soul-crushing betrayal. But Riven has developed a terminal malfunction: he truly loves her. Now, Lena is back in the land of the living, but the world is starting to pixelate. To save her, the machine that was meant to kill her has built her a cage. And in the Aftergame, mercy is the most terrifying fate of all.

His hands framed my throat, his thumb tracing my racing pulse. Desire darkened his gaze. “Say it,” he whispered, raw and commanding. “Say who you belong to.” “You,” I gasped, voice breaking into a moan as his rhythm consumed me. “I’m yours.” His mouth claimed mine, all fire and hunger. ⸻ Talia never expected her worst nightmare to be her destined mate. Cassian — the boy who made her life a living hell, the one she swore she’d never forgive — turned out to be the one fate chose for her. Now bound by a force stronger than hate, she must decide if love can bloom where pain once lived… or if some scars run too deep. But fate isn’t done with her yet. Because in the shadows waits another bond, a second mate whose touch feels just as forbidden… and just as inevitable.

Ember felt her world shatter, when she got the news of her family's total wipeout, leaving her as the only surviving member of the family. Struggling with grief and heartache, she seeks for solace in a clubhouse, where she met Alpha Marcus her supposed mate, after which she was plunged into a nightmare of kidnapping, torture and rape. On the brink of death, she prays to her ancestors to be given a second chance at life, to avenge and reclaim her destiny as Luna. Being reborn with the strength of her ancestors and a child destined to reshape their world, Ember begins her journey of relentless justice, navigating treacherous alliances, hidden truths and a love torn between two powerful Alpha, wills. But with the fate of her world in the balance Ember's final choice lead to salvation or doom? In the tales of vengeance, love and rebirth, Ember must make a choice.

Alicia thought she’d married perfection, until the mask slipped and the monsters stepped into the light. Betrayed by her husband and his lover, she died despite Catherine’s desperate warnings, and Catherine’s ultimate sacrifice to save her. But death isn’t the end. Alicia returns reborn: no longer the trusting woman who loved blindly, but a breathtaking force with a heart of ice and a ledger of debts to collect. Those who turned her life—and Catherine’s—into a nightmare will face the storm she’s become. Then a hand circles her waist, a voice low and certain: “You’re not Catherine. Who are you?” Andy’s eyes pin her, and the past and present collide. Who is she now? A woman forged by betrayal, sharpened by loss, and reborn to reclaim her power—even if love dares to stand in her way. A tale of rebirth, revenge, and a heart learning to beat again.

Mara's world went dark at thirteen, she however found a safe haven in Kenny's world. The gentle man who promised to become her eyes and protector. And so she gave herself to him completely, against the cruelty of his wealthy family and the mockery of the society. Her marriage however turns into a nightmare when she begins to notice disturbing changes in the man she shared her bed with. Until one day, Mara stumbled upon the devastating truth. Kenny had been secretly sharing her with his identical twin brother, Danny Ace. Pregnant and betrayed, Mara escapes only to discover that leaving the Ace brothers is far more impossible than loving them. Trapped in a wave of betrayal. jealousy, desire, Mara must uncover the truth behind the twins toxic obsession before they completely destroy her and her son.

A student on a school camping trip gets possessed by an unknown creature; giving him special abilities and forcing him to its bidding, thus bringing a devastating threat to the camp and its surroundings. Has an elusive evil truly returned? Can the possessed student find a way to regain full control? And what are the origin and motives of the creature? Dive into a world of ignorance, mysteries, and thrills as the Unknown Origins series unfolds. Black River (Apocalypse Uprising) [Major sub-story synopsis] Dolly and her best friend Chesa go on a trip to visit the enchanted river, unaware of the strange happenings in the community living close to it. What will happen if their quest for paradise leads to desperate attempts to survive? and will they ever return home from the nightmare? [sub-stories in this book can be read at anytime the reader wishes, but it is advised to follow the plot sequentially. See note for more information. This book is rated 16+ because of its dark theme.]

Solene only ever wanted two things in life, to be free of her mother's cruelty and to get into a prestigious college. Her dreams fell short when her mother announced her marriage to billionaire Alfred Campbell, the father of the one guy that made her life a living hell in school. Noah Campbell is not only a spoiled rich brat, he's made it his life mission to torment Solene. Now she's to live under the same roof as her hot tormentor. Solene thought it would be her worst nightmare, but something else came to life inside her. Their relationship skyrocketed from enemies, to lovers sharing passionate kisses in the room. Will Solene's relationship with Noah shield her, or will it destroy the very life she's spent a long time building?. Find out in this irresistible, forbidden, steamy, step sibling romance.

Anastasia's life was turned into a nightmare when the intimate photos of her mate, Antonio, and Stephanie were displayed on a large screen meant to showcase her and Antonio's love story on her wedding day. Her father had a heart attack out of shock and was rushed to the hospital. While her father was still battling with his life in the hospital, Anastasia found out from her father's secretary that Stephanie had taken over her father's company, his only legacy. As if that wasn't enough, she was also sacked from the company due to the scandal for which she was framed. In desperation to save her father's legacy, she decided to seek help from Antonio's uncle, Alpha Alex, A ruthless and powerful Alpha who was fear by all and rumored to have a hidden secret that stopped him from having a love relationship. He agreed to help her but with a mysterious condition. Will she be able to accept the condition?

She thought she was the love of his life, and he became the love of her life that fateful day she had seen him at the pack's party. Selene Grace was only a replica of Alpha Leo's real mate, and when he spotted her, Leo immediately claimed her as his Luna in order to suppress the rumors of him being mateless. Being unable to conceive turns Selene's marriage into a nightmare, and as if that wasn't enough, Alpha Leo finally reunites with his long time lover and mate, rejecting a pregnant Selene as a result. 5 years later, Selene, a now successful doctor, receives an invitation to the moon shadow pack in order to rid the pack of a deadly disease which has struck it. Will Selene return back to the pack which had caused her so much pain, and what would she do when she realizes that she is mated to the Alpha who had betrayed her in the past?