This work compiles real-life submissions from the SM magazine "Mania Club," based on the actual experiences of a contributor named Sachiko (pseudonym). Sachiko is a proud mother of Kou, her son who excelled academically, graduated from a top-tier university, and secured a job at a major corporation. However, Kou becomes involved with an older man named S he met online, who influences him to develop sadistic BDSM tendencies. Kou begins to see his own mother, Sachiko, not as a parent but as a woman and desires to treat her as his slave. Upon hearing this shocking confession, Sachiko is overwhelmed with despair, guilt, and regret for failing to understand her son's twisted emotions.
In Scene 1, at Kou's request, a stranger is hired to film his mother being trained in his absence—marking Sachiko's first rental training experience. She is repeatedly punched in the lower abdomen by the man she's never met, causing her to wet herself again. As punishment for the accident, she is forced into a dog-like position and subjected to relentless spanking. Enduring both pain and humiliation, she watches him smile with satisfaction.
In Scene 2, her nose is twisted with a hook, a gag is forced into her mouth, and her genitals are brutally struck. Overcome by fear and agony, she lets out pig-like screams. Her entire body is then clamped with clothespins, inflicting relentless pain until she breaks down in tears. The man watches, laughing with clear enjoyment at her pitiful state.
In Scene 3, Sachiko is tested on her duties as a slave through "service." She diligently licks the man's nipples, cock, scrotum, and anus for an extended period, striving to please him, but ultimately fails to satisfy. Lying on the floor, she is punished with a double piss shower from both S and the man.
In Scene 4, the scene moves to the bathroom where she is given an enema before continuing her service. While performing fellatio, she can no longer endure the cramps and involuntarily releases foul-colored liquid from her anus. Unable to make him cum in her mouth, she instead satisfies him by taking his load in her vaginal passage. Thus, Sachiko submits to her son's desires, pushing herself to the edge while navigating a harrowing journey of deep emotional turmoil and suffering.