In the year 1791, Aisaka Sojiro is a samurai and also a popular shunga (erotic art) painter. But, he is banned for corrupting public morality with his drawings. He is arrested and is about to be executed. At that time, Sojiro finds himself in the present day. He meets manga writer Miyagami, who becomes his teacher while he works as his assistant. Sojiro soon meets a woman and he falls in love with her at first sight.