On her twentieth birthday, a lonely college girl named Chitose crosses the torii gate of a shrine and wanders into the other world of "Sen". She is picked up by a handsome hermit medicine doctor, Rei, and works as his apprentice, but is scolded daily with the words, "You fool!" She is scolded every day. However, as she cooks medicinal dishes to heal customers, she finds his own place in the world. Moreover, she begins to get closer to Tori, a dignified and beautiful young man who adores Rei....?!