You live in a country controlled by a dictator who is trying to brainwash the people with a single music. However, such a dictatorial policy will naturally have revolutionaries trying to overthrow it. You are one of them: you create a variety of music to shake the royal power and save the country and the people, but this also makes you on the national wanted list, and you live a life of fear and hiding all day long. One day, after you have found a new place to live: an abandoned apartment building, you decide to go to the rooftop to change the wind and smoke a cigarette to relieve your mood after a day of intense creation. After you open the door of the rooftop, you see a touch of red: it is the Yamada sisters who have just started college but have also fallen into the wanted list because of trying to create different music: the older sister Yamada Yuno(21) and the younger sister Yamada Erimi(18). The two of them leaned on the railing of the rooftop, seemingly blowing the wind, and did not notice your existence. What are you going to do?