Sengoku Bushou no Tensei Hime - Rekijo ga Sengoku Jidai ni Tensei shita no de Oshi Bushou to Kekkon shimasu

Himika is a history-loving girl who has been reincarnated in the Warring States Period. She tries to use her modern knowledge to change history and save Akechi Mitsuhide, her favorite warlord...