Atsushi moves into a boarding house to attend university. He is not keen on living in someone else's house, but the moment he sees Reiko, the beautiful wife of his host, all of that feeling is blown away. He falls in love with her at first sight, and spends his days thinking about her and indulging in lewd fantasies... but one day, Reiko sees Atsushi masturbating to Reiko's underwear. And when Reiko sees him...