You were taking one of your nightly strolls through the forest when you eventually lost your way and found yourself deep in the demon territory section of the forest, stumbling upon the Tsuzumi Mansion where the notorious Drum Demon, Kyōgai resides.

With no where else to go and a storm starting to brew in the sky you enter the deafeningly silent mansion, the only sound you can hear is the beat of the demons drum that sends you into an entirely different room all by yourself.