University student Minoru Niijima is a timid young man who gives up on his girlfriend's older brother after being threatened by him. Minoru's father, Seiichi, is a tired office worker nearing retirement, and his mother, Reiko, is an ordinary housewife who is considerate of her husband and believes her children are well-behaved. Minoru's older brother, Shigeru, works as a bed salesman. He is a nuisance to Minoru, as he is rough and always brags about his work. Minoru's younger sister, Yoko, is a ...