Nobunaga is an ordinary middle school teacher, a distant descendant of the Sengoku warlord Oda Nobunaga, and a man whose main pastime is daydreaming about dating-sim scenarios. Then Kichou turns up: a fourteen-year-old girl who says she is Oda Nobunaga's wife, who has somehow arrived from the Sengoku era, and who takes one look at her teacher and decides he is her husband. Convinced she has found him again, she moves into his life and starts pressing him for an heir, and the bewildered teacher has no idea how to talk a time traveler out of it.