Chronicles of Primordial Wars - Chapter 685 - The Giant Bridge of the Flaming River

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?

After breaking up with his girlfriend, he accidentally acquired a genius system and rose from there against the heavens, becoming invincible..

- Description from Novelupdates

As a Male Ant King, Dragon Cypress is supposed to be welcomed in in the all-female Ant Clan Kingdom. The reality, however, is the opposite. Seventeen Great-Headed Ant Kings all express no interest in him. Fortunately, Dragon Cypress stumbles upon Dominating Throne, the brainchild of another civilization, which allows him to breed even without a female ant and build his kingdom.[Experiment number GADSSS541, Top secret][Creator Civilization, Dominating Throne, gene information identification and editing system overhaul complete, transported by the Alliance Expedition Army's 168th Army, 741st Corps Commander Hou Wenfeng, handed over to Phoenix Galaxy GA541 laboratory director Liu Zhihong...][Please select a type of Messenger][Guardian of Strength][Producer of Agriculture]

Her step-sister just died three months ago. Now, she insists on marrying Chu Lui, who is supposed to be her future brother-in-law, the mind behind the Chu Enterprise. The world is sure that she, the new bride-to-be, had caused her step-sister’s death in order to seduce him.