Natsumi has been working as a housekeeper for the past year at the Kimura family, a friend of hers who passed away at a young age. - Her husband and his eldest son, Daisuke, had a good relationship, but the second son, Yusuke, did not open up to Natsumi, and Natsumi was worried alone. - One day, her husband is going on a one-month overseas business trip, and Natsumi ends up living and working at the Kimura family, but... - On the first day, Natsumi takes a bath to relieve her fatigue. - Then, when Natsumi gets out of the bath, all of her panties are gone...