Kanzaki Chihiro, 27 years old. Four years into her marriage, she has no children yet. Her sex life with her husband has become monotonous and unsatisfying, prompting her to apply for this opportunity. Her sexual partners, including her husband, total two. Her serious personality has ironically become a source of stress, and she feels something inside her has begun to change. She murmurs, "My body... my husband wants me about three times a week... but it's always left me feeling unsatisfied... I know I should just endure it... but..." Seeking new excitement and hoping to transform herself, she has taken this step as a personal challenge.