Misono Kazuka, a busty beauty who is exploding popularity, has released her first black sex in her life! ! Kazuka, a new graduate who works for a sake brewery, has a boyfriend who promises to marry him. One day, he decides to go on a business trip to a rural area and heads to a ryokan that his company has prepared, but the inn is a cheap hotel, and a male black tourist is staying in the next room, which is a fusuma-ridden. Kazuka is confused, but gradually she accepts her feelings for the black customers who treat her kindly. At that moment, he had a big fight over the phone with his boyfriend...