Mahiro is engaged to Yuzuru, heir to a 150-year-old kimono shop. To marry into his prestigious family, she must earn the approval of his strict father. Beautiful, devoted, and demure, she seems like the perfect bride—but she secretly has another identity: Rika, a legendary escort who ranked number one for two consecutive years. Determined to keep it hidden, she presents herself as chaste and refuses intercourse until marriage, allowing only teasing right up to the edge. Yet the highly experienced Rika unconsciously reveals her astonishing sexual technique. Yuzuru grows suspicious, while his father hires a detective to investigate her background. What will she do?