The eldest, second and third sons. The three brothers live in a house next door to a beautiful, hardworking and caring married woman named Karin. One day, when the eldest brother returned home from shopping for food and daily necessities for his younger brothers, Karin greeted him with a gentle smile. "If you don't mind, I'll help you with some of the housework," she said, smiling as she came to the house with him. The three brothers, who are horny, can't help but stare at the bulge of the wife next door who cooks and cleans with ease...