Kiyo, who raised her son Soshi single-handedly, finds him bullied at school and unable to attend. It was his classmate Yuu who helped Soshi get back on his feet. At first, Kiyo was grateful for his kindness, but... it turns out he was the mastermind behind the bullying, and now he's demanding money in exchange for helping Soshi. Yuu, emboldened by his success, takes advantage of Kiyo's vulnerability and demands her ripe body. Kiyo, whose secret is now known to him, is forced to comply and insert a vibrator into her pussy as he commands.