The main character is a modern-day OYASH Saburo. He cannot stand history lessons and generally does not understand why he should know what people who lived several centuries ago were doing. But one day he accidentally falls into a time rift and is sent straight to the Sengoku era, where he meets the very young Oda Nobunaga – a future great military leader and one of the most influential figures in Japanese history. It turns out that Saburo and Oda look alike as if they were twins. Nobunaga has a cautious life in the castle, he wants to go traveling, and to prevent anyone from noticing – he leaves a double in his place. Unable to return to his own time, Saburo decides to play along and at the same time make sure that history unfolds as it should.
