Kiyotaka, the only son of Yuko, has been out of the luxury condominium where her sister lives for a while while she goes on a trip. - Yuko smiled when she saw Kiyotaka, who couldnt hide her joy in living in her mansion, even though she was a little disappointed by her sister who didnt care about Yukos circumstances. - Mom, lets take a bath! Kiyotaka proposes to Yuko after seeing the bathtub, which may be three times as large as her own house. - And the two will spend the bathing time without entering the mother and child water ...