The story follows a brain surgeon named Minakata Jin who has spent the last two years in anguish as his fiancee lies in a vegetative state after an operation he performed. One day he faints at the hospital and awakens to find himself transported back in time to the Edo period. He is soon attacked by a samurai but he escapes with the help of a man named Kyotaro. Kyotaro suffers a serious injury to the head while trying to protect him but Jin manages to save his life despite a lack of proper medical equipment. Because of that Kyotaro's sister Saki begins taking an interest in Jin and becomes his assistant. Meanwhile Jin is determined to find a way back to the present.