Shio has fallen into a slump in her marriage and has become sexless with her husband. Her sexual frustration reaches its limit, and she becomes so engrossed in lewd solitary play that she forgets to lock the door. Then her neighbor Satoru comes by with a souvenir from his trip. He bursts into Shio's room to make sure she's safe, and what he sees is Shio's lascivious, moaning face as she orgasms. Her breasts shake and bounce in every direction as she trembles with pleasure. He has secretly been interested in Shio, and his love for her begins to run wild as he sees her in a lewd state that he's never seen before.