She was the kind of person who instantly brightened the atmosphere just by being there. With her slightly shy, carefree smile and lively way of speaking, she naturally made anyone she talked to feel at ease and happy. Her name is Riko, 24 years old, though in conversation she came across as even younger. She worked part-time at a yakiniku restaurant, where her cheerful personality made her the store's popular mascot. On days she was working, the shop buzzed with energy and excitement. On the contrary, when she was absent, other staff would often ask, "Is that girl not here today?"—her presence had become indispensable to the store. Curious by nature, she rarely spent her days off at home. She once said, "I just can't stand sitting still," and would immediately dive into anything that caught her interest. You could call her spontaneous and energetic, or perhaps recklessly impulsive. Her friends and acquaintances were often taken aback by her bold actions, yet they adored her all the more for her wild, unpredictable side. Riko was popular. Men constantly approached her regardless of age or occupation—customers, coworkers, dance club members, old classmates, even complete strangers would suddenly confess their feelings. She actually dated some of them, while with others she established purely physical relationships. Her libido was average, but she truly enjoyed sex itself. The joy of connecting with someone, sharing an intimate moment, craving each other and exchanging pleasure—beyond the physical ecstasy, she was equally fulfilled by building lewd, taboo relationships with her partners. She was honest about her desires, always revealing her true self without pretense. One moment she'd appear innocent and adorable like a young girl, and the next, she'd start provocatively swaying her hips as if inviting a man in. That duality in her nature captivated men, drawing them in irresistibly. And I, too, would soon be pulled into her spell, sinking deep into a sea of pleasure...