Kota, a son who can't get rid of the habit of peeking while thinking that it shouldn't be done after knowing that her mother-in-law Nana is secretly masturbating in the bath. One day, Kota, who was cleaning the bath with Nana, inadvertently sprinkled Hose water on Nana. Kota was in a hurry for a moment, but when I looked closely, Nana's no bra's breast became soaked ... Finally, Kota who couldn't control her excitement pushed Nana down with her instinct.