While walking through the forest one day, a witch named Alyssa finds a bush glowing with a magical aura. She discovers a baby who, although not a witch, possesses magic that is too strong for that of a mere human. As such, Alyssa decides to raise the child as her own, naming her Viola. Sixteen years later, Viola is all grown up and now towers over her youthful mother, and her mature looks cause many to confuse their ages. Nevertheless, Alyssa adores her child despite Viola's possessive streak and tendency to drive away anyone she fears will take away her mother's love. Viola may not be sure where she came from, though she has all she needs in Alyssa and the plethora of Alyssa's friends who have come together to raise her. Under Alyssa's guidance, Viola will learn to master her magic and make her adoptive mother proud.

Due to poor finances, an epidemic, and famine, the once prosperous Tearmoon Empire ultimately falls to a revolution instigated by its citizens and supported by neighboring nations. The rebellion also brings dire consequences for Mia Luna Tearmoon, the empire's extremely spoiled princess, who endures three years in the dungeons before facing execution. By some miracle, Mia finds herself reincarnated as her 12-year-old self, retaining full memories of everything that had transpired. With the pain of the guillotine blade freshly imprinted on her neck, Mia is determined to use this second chance at life to avoid the grim fate that awaits her. She utilizes all her knowledge to improve the state of the kingdom and gather personal allies, inadvertently winning over the people's hearts and becoming beloved as a saint.

On the run for crimes she did not commit, disgraced noblewoman Charlotte Evans collapses deep in the forest. A sorcerer named Allen Crawford—also known as the Demon Lord—finds and defends Charlotte from her pursuers. Since she has no place left to go, Allen takes pity on Charlotte and offers to hire her as a live-in maid. Allen quickly realizes that Charlotte has faced ridicule and hatred all her life from her so-called noble family, and she has never known what true freedom feels like. He decides to teach her about all the naughty things the world has to offer and enables her to surrender to her whims and impulses. Charlotte's sweet innocence proves an obstacle to his plans, but Allen is determined to show her the kind of life her family has denied her. Although he despises being social, Allen begins to open himself up to Charlotte. The longer they live together, the more they discover their similarities. Though most people have abandoned them, the duo promises to stay together, oblivious to their budding feelings for each other.

With the conclusion of her favorite romance manga, Fuuko Izumo is ready to end her life of misery and loneliness having long accepted her fate of never being able to experience passionate love like fictional characters. Cursed with unluck, anyone Fuuko touches is in grave danger of experiencing unimaginable calamity. While the possibility of imminent danger would have most sane people run in the opposite direction, Undead has other ideas. He is an immortal being with superhuman regenerative powers desperately seeking death, which has always eluded him. When their paths finally cross, Undead sees an opportunity to finally end his suffering by using Fuuko's unluck. But before Undead can unlock the full potential of Fuuko's power to trigger the final devastating blow, the duo must first fend off a murderous secret organization hell-bent on exterminating those with special abilities.