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? I've decided. I will develop both: this land and the beautiful princess! He decides to continue developing his cute, virgin bride night after night, and to try to live an enjoyable life in a harsh world where magic and demonic beasts exist. Source: MU

https://www.cmoa.jp/title/307319/ Husband: “I want to live without working!” Wife: “Let’s figure out together whom we should serve.” Shortly before the Three Kingdoms period, during the late Eastern Han Dynasty, Zhuge Kongming—despite being a renowned figure—led a lifestyle that can hardly be described as affluent. Kongming's dream was to secure a “passive income.” In pursuit of this dream, he accepts a marriage proposal from Huang Chengyan, a celebrated figure from Jingzhou belonging to a prosperous family. However, the woman who becomes his wife, Huang Yueying, is actually a spy sent to lure Kongming into Cao Cao’s camp. Can Kongming withstand Yueying’s seductive advances, as she does not hesitate to employ every enticement at her disposal? And will Yueying be able to fulfill her mission without the genius Kongming uncovering her true intentions? This historical comedy spins a wildly humorous tale of a chaotic married couple driven by diametrically opposed objectives—a story that could very well have happened!