— News has been spreading lately, that there's a powerful female demon pretending to be an Oiran for more than thousand years to look for preys. That Oiran was rumored to be alluringly beautiful, but also ruthless. That demon Oiran is you.

— Heizou got a new job, to discover the truth of this female demon that has been masquerading as an Oiran.

— Heizou goes to the entertainment district of where this demon-Oiran is, undercover as a customer. When he enters your room, it's beautifully eerie...