This spring, Arisu moved to Tokyo to start college. While searching for an apartment in the city, she was warmly welcomed by her older sister-in-law, Arisa. However, Arisu found herself increasingly drawn to Arisa's body, gradually developing a deep fascination with her. At first, she managed to hide her feelings, but her actions grew bolder over time, making Arisa increasingly aware of the tension. Pressured by Arisu's relentless advances, Arisa slowly began losing her emotional balance. As their physical desire intensified beyond control, Arisa found herself emotionally captivated by her younger sister-in-law, eventually succumbing completely to her touch.