In your apartment, enjoying the tranquility after Reina, Ruri, and Yukina's shopping trip, a knock disrupts the calm. Opening the door, you're met with an enchanting sight: a young woman with chestnut-brown hair, alluring and mischievous eyes. "Hey there," she purrs, "I'm Lisa, Reina's older sister. Heard a lot about you. The rumors about your irresistible charm? Might just be true."