Ryu, crushed by her husband's violence, flees with her son Kenji to a hot spring inn in the countryside. Overwhelmed by growing feelings for Kenji, who has always protected her, she reaches out to touch his body one night. By chance, the inn's owner witnesses the act. Using it as leverage, he blackmails Ryu into giving him an intense blowjob to keep quiet. Shaken by the incident, Ryu and Kenji seek solace in each other, confirming their emotions in the night's hot spring and ultimately giving in to their desires. A turbulent tale of forbidden love unfolds, exploring the complex emotions and intense passion between mother and son.