Novel: Nobunaga’s Imouto is My Wife

Alternative Name: Nobunaga No Imouto Ga Ore No Yome ~ Sengokujidai D, Nobunaga’s Younger Sister Is My Wife~ How To Enjoy, Nys, 信長の妹が俺の嫁 ~戦国時代で楽しく領地と妻を開発する方法~

Author: 井の中の井守, Newt In The Well

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.