Saki is an exemplary and beautiful wife who is diligent and always participates in neighborhood events. While she always appears perfect in front of others, she has a secret hobby of relieving stress by exposing herself and masturbating on park benches and in toilets every night. One night, Saki is indulging in vibrator masturbation in a public toilet as usual. A man named Murata happens to be passing by and hears a faint sigh, so he knocks on the toilet door...