One humid summer night... While her husband falls asleep, enjoying the pleasure himself, Chiharu is hiding and masturbating in the bathroom. Little does she know that her son Atsushi is watching her... Sweat trickles down his mother's voluptuous body, and her lustful juices spurt out from between her legs, making squishy noises... The son, seeing his mother for the first time in his life, is aroused by her seductive and alluring appearance, which is too seductive to be described as vulgar, and takes advantage of the opportunity when his father goes out to approach his mother...