Surume Mizugaki

He's lazy, arrogant, and a total scumbag, but his potential is the strongest in the world?! One day, the protagonist reincarnates as "Shin Darkside", a villain noble from a game he was super into. A life full of ruin flags drives the protagonist into despair, but it turns out Shin has the cheat skill \[Gluttonous Demon King], a mighty power which lets him devour other's magic and skills to turn them into his own! "If I train this skill to break its limit, maybe I can escape these ruin flags?" With the knowledge of the original story from his past life and the Gluttony Demon King skill, Shin tries to defy his doomed future! Without realizing it, he starts acting like a main character... and before long, cute heroines from the original story and powerful allies who admire the former tyrant Lord Shin start gathering at his side...?!

Sophia, the daughter of a marquis, was engaged to the second prince, Delm. Both of them worked at the Royal Institute of Magic Research, but Delm often pushed his work onto Sophia under the guise of their engagement.One day, Sophia invented a new type of magic, but Delm stole her research paper and registered the magic under his own name. When Sophia demanded her rights back, Delm refused and falsely accused her of lying about the theft. As a result, Delm was celebrated as a genius within the institute, while Sophia was ridiculed and labeled incompetent for failing to produce any results.Her reputation as a researcher was ruined, and her only cherished laboratory was taken away by Delm. To make matters worse, Delm unilaterally called off their engagement, stating, “Someone as incompetent as you isn’t worthy of being my fiancée.” Devastated, Sophia returned to her family estate, having lost everything.However, through a twist of fate, she became engaged to Leo Santorina, known as the “Ice Wolf Prime Minister” for his cold demeanor. Despite his reputation, Leo was kind-hearted but awkward in expressing himself. With his love and support, Sophia gradually succeeded as a researcher. Meanwhile, Delm’s downfall began to unfold… (Source: Magazine House, translated)Original Web Novel

"You don't find me attractive? Then let's break off our engagement." So said Serena, the daughter of a marquis, to Elliot, her childhood fiancé. He repeatedly broke his promise to escort Serena, and when he showed up to a party with Maribel, the daughter of a duke, who was seducing someone else's fiancé, she finally snapped! After breaking off their engagement, Serena was able to fully enjoy the fashion she had been holding back on, and she began to rediscover her true self - her narcissistic and slightly bad-tempered self. Then, the second prince, Nox, who is known for hating women, suddenly proposed to Serena -!? (Source: Futabasha, translated)