Sumi Kurokawa, entering her third year of marriage, feels deep dissatisfaction with her sex life, particularly due to her strong preference for well-endowed men—her husband's size leaves her unfulfilled. With a deeply masochistic personality, Sumi begins with shameful masturbation, then is bound with traditional rope and brutally deep-throated by a large cock. Forced into a red under-kimono, she is tightly restrained and brought to multiple orgasms with a massive vibrator. Finally, she's overwhelmed in a relentless threesome, receiving repeated creampie loads deep inside her pussy, finally experiencing the intense satisfaction she craved.