Natsume Iroha, burdened with massive debt as a guarantor for her husband, desperately seeks a way to repay it and turns to an "outcall massage" service she found online. However, the business is in reality less a legitimate spa and more an illegal outcall brothel. With no knowledge or experience, she is easily drawn into this world of illicit services. The moment she makes that choice, she steps into a dark abyss from which there is no return.