Nobunaga's Younger Sister is My Wife

A history-loving high school student, Fukai Nagamasa, suddenly wakes up one day as Azai Nagamasa, a Sengoku-era warlord of Omi Province!

Thrown into the Warring States period without understanding why, Nagamasa soon finds himself marrying Ichi-hime, the stunningly beautiful younger sister of Oda Nobunaga. He enjoys an unforgettable wedding night and indulges in his dream-like new life. At the same time, as a daimyo, he skillfully governs his domain, aiming to surpass the year 1573, when history dictates his downfall at the hands of Nobunaga. However, this is not the Sengoku era he remembers—this world is a parallel version of history where monsters exist...