Nobunaga-sensei no Osanazuma

Nobunaga Sensei no Osanazuma (ノブナガ先生の幼な妻, "Mr. Nobunaga's Young Bride") is a Japanese romantic comedy manga series by Azure Konno. It has been serialized in Futabasha's seinen manga magazine Monthly Action since May 2017 and has been collected in three tankōbon volumes. An anime television series adaptation by Seven premiered on April 6, 2019.

Plot
"One day, a girl who loves me will suddenly appear before me"—Middle school teacher Nobunaga has always been dreaming of such a gal game-like situation. However, the one who appeared before him was Kichou, a 14-year-old girl who proclaims herself as his wife. Appears to have arrived from the Sengoku era, she mistakes Nobunaga as Nobunaga Oda and urges him to conceive a child with her. Thus begins the age-difference love comedy between a gal game-loving teacher and a Sengoku era expert princess.