In this intimate encounter between cousins Yano and Rui, they explore their desires together. Both were only children growing up close like sisters, sharing various experiences that shaped their unique sexual preferences. While Rui enjoys sex without boundaries, Yano finds herself more attracted to women and less interested in men. As time passes, Rui subtly introduces her cousin to the world of yuri (lesbianism). Note that the recorded content may vary depending on the distribution method used.