Ryoko Asamiya, a married woman who enjoys drinking wine, finds herself lonely in the absence of her husband and turns to alcohol from morning onwards. To satisfy her sexual desires, she engages in an incestuous relationship with her son, who naturally craves his mother's body in return. With her son busy attending cram school and short on time, she often brings him to climax with blowjob sessions without intercourse. After bathing, while sipping wine, her real younger brother—someone she once had a romantic relationship with—pays her a visit. Drunk and vulnerable, Ryoko ends up sleeping with him again. Later, when her son returns home, she gives him a blowjob in the bathroom, and once again spends the night indulging in intense, passionate sex with him.