Unable to satisfy her sexual desires due to her husband's neglect, the stepmother Maki secretly masturbates to release her frustrations. Her hikkikomori son always peeps at her through the door crack. One day, seeing Maki's sexy backside as she cleans the floor with her ass exposed in the living room, he becomes aroused and attacks her. Completely forgetting about her hikkikomori stepson's existence, Maki thinks she is alone and desperately tries to escape as her stepson attempts to pull down her skirt and underwear...
