Society is split between the rulers and the ruled. Throughout his life, Kamitani Naoya has belonged to the latter group, striving to climb the social ladder with little to no success. He catches the eye of a peculiar man named Tsukui and discovers that genuine spirits exist in this world. In fact, the college he attends is teeming with spirits hailing from ancient Japan. However, these spirits are not seeking companionship, but rather a tasty meal. And Naoya is the main course!