Every time Akio hears an update from his wife, who has returned to her hometown to give birth, he savors the joy of soon becoming a father. However, contrary to his desire to welcome his daughter-in-law in perfect condition, the house is becoming messy... Just then, his wife's older sister, Chinatsu, comes to check on him. Although he has left everything to Chinatsu, Akio can't help but stare at Chinatsu's chest and buttocks as she does the housework. "Looking at my sister-in-law who came to see me out of concern for me like that..." he was thinking when he heard that.