Saki is an exemplary and beautiful housewife who is serious and always participates in the neighborhood events. While she always appears perfect in front of others, she has a secret hobby of exposing herself and masturbating on park benches and in the toilet every night to relieve stress. One night, Saki is indulging in vibrator masturbation in a public toilet as usual. Murata, a man who is passing nearby, knocks on the toilet door, relying on the faint sound of Saki's breathing.