Recently, Ryo has been getting a little tired of her husband being too meticulous with his time. - She was unable to get used to her husband's special sexual habits during the night, and secretly built up her frustration. - One day, my brother-in-law Ryuji suddenly came home... - Ryo sees through the hidden desire to help her brother-in-law, a playboy, and is seduced by him, leading to a relationship with him. - She continues to experience climaxes she has never experienced over and over again due to the violently undulating rhythm of his cock that she cannot feel with her husband. - Still, Ryo stubbornly tries to refuse the invitation...