Lumina, a brown-skinned gal girl working at an apparel store in Shibuya, usually leads a lovey-dovey life with her gal boyfriend, a real-life fulfilling gal. However, her boyfriend is a tricky character, a perverted S-type with an ora-ora demeanor. He enjoys taking Lumina to a happening bar and letting creepy men violate her, which is his hobby. Although Lumina has broken up with him, it's difficult for her to escape the addictive nature of these perverse acts. She has voluntarily applied as a lone male dog to the current circle, a gathering of perverted enthusiasts who were fans of her ex-boyfriend, indulging in everything from flashing to creampies. For a masochistic beast-like woman who has no interest in 1VS1 sex, she gathers multiple rare male dogs and invites them to an erotic sweaty circle party, where she fully embraces pleasure with raw male organs, making her ex-boyfriend want to say, "Such an erotic beast, only circling was possible, wasn't it? I deeply understand your feelings."
