Aika is a popular masochistic sensual girl with a unique appearance, but not so good at teasing. She works as a dominatrix, but in reality she is a genuine "extreme masochist." When teased by a man, she feels so much that she can't stop herself, so she pretends to be a "S" when serving customers, but she can't meet the harsh demands of the middle-aged customers and they see through her lie... A reverse training sex where the strong-willed gal is made to cum over and over again, with no way to do anything about it, where the roles of master and slave are swapped. KM Produce Co., Ltd.