The protagonist lives in a massive penthouse, which could be called a mansion, in a large city reminiscent of American cities in the 1960s. While he usually exhibits a gentlemanly demeanor, he transforms into a sadistic sex as soon as the sun sets. Under the guise of "education", he subjects his busty maids to nightly SM sex. His treatment of the maids is somewhat rough, with a hard sex menu and little affection shown. This stems from his profession as an "exorcist."

The maids who serve the protagonist are actually "demon-possessed."

An Exorcist can extract and destroy the energy of the demon from the "demon-possessed." This demonic energy is discharged from the body of the "demon-possessed" when they experience pain or pleasure, leading to sexual arousal. The more extreme and perverted the S&M they engage in, the more efficiently the "demon-possessed" can be brought to a state of sexual arousal, making the protagonist, an Exorcist, suitable to purify them.

It is the protagonist's mission to engage in S&M with these beautiful busty maids and save them.