The sound of quiet waves.Glittering water surface.The shadow of a woman frolicking on the beach.Her mother, Shinobu, and her son, Yasuhito, were on an annual family trip together.Yasuto was a little nervous about traveling without his father, who couldn't come because of work, because he had fallen in love with Shinobu since he first met her new husband.Playing with her mother at the beach, taking a bath with her mother at the inn where she's staying... While doing so, Yasuto's feelings for her mother exceed the limits of his patience, and that night he attacks Shinobu. rice field.