The Henn Hotel is a special place in the suburbs of Kyoto, serving as a portal between the world of people and the world of spirits, from where the most terrible creatures described in the myths and legends of Japan are constantly trying to break through to us. It is for this reason that the hotel needs a new custodian every hundred years. One day, the guardian turned out to be unworthy of this position and a threat loomed over humanity, whose name was Ren.