Nobunaga-sensei no Osanazuma

Nobunaga is a middle school teacher who constantly dreams of an adoring beautiful girl appearing in front of him. One day, Kichou, the 14-year-old wife of the real-life Warring States period warlord Oda Nobunaga, does appear in front of him after having apparently traveled through time. She mistakes the present-day Nobunaga for the historical Oda Nobunaga, and tries to get him to get her pregnant.