Harry Potter: Returning from Hogwarts Legacy - Chapter 20: Crazy Junior

The male student, Fukai Nagamasa, ignores his studies for college entrance exams in favor of following the path to chuunibyou. As he fainted during night cramming session before the exams, he realized that he was transported to a parallel world as a feudal lord in the Sengoku Era. Not to mention that suddenly, he was marrying the sixth Demon King, Oda Nobunaga’s little sister, the one who was purported to be an unrivaled beauty?

When powerless, unfavoured Princess Soleia was arranged to marry the newly titled Duke Orion Elsher, she assumed they would find love eventually.Who knew that her father would send off her husband mere hours later to fight a war?Soleia was left alone to deal with an impoverished fief, a crumbling estate, and spiteful, vindictive relatives of the Duke who all wished to see her gone.She couldn’t leave― there was nowhere else to go. Soleia desperately wanted her husband to return so he could offer her a helping hand. However, when he did, he returned with Elowyn, a woman he claimed was his true love.A woman hellbent on taking her place as the rightful Duchess, no matter what she had to do to get Soleia out of the way.Mistreated, misunderstood, and miserable, Soleia was eventually thrown out of the estate she helped build.Fortunately, when one door closes, another one opens. Unknown to Soleia, a man more powerful than her husband had been watching her, waiting for the right time to snatch her into his gilded cage. Duke Elsher had been foolish to let go― but the crown prince of Raxuvia wouldn’t make the same mistake.***Prequel to Stolen by the Rebel King.

A mysterious teenager who had lost his past, awakened in Tianlong Continent. Mistaken as the Ye family’s Son, he used this identity to observe this chaotic world and to search for his past self, but only to find an inevitable and terrible fate, therefore he indignantly laughed at his destiny, and revealed his prowess to rule the lands under the heavens.

Since then, the air and the clouds moved with his hands, and even thunderstorms were subject to his palms! He, as the fairytale’s main character, had shocked the people of Tianlong Continent with his legendary prowess and intelligence, but the extent of his powers were still unknown.

- Description from novelupdates

For the wine to be drunk on her wedding night to actually have been a cup of poison and for the one to poison her to be her husband, who would believe it?