I grew up in the countryside and moved in with my older brother and his wife to attend a prep school in Tokyo. When my brother suddenly left for a business trip, I ended up alone with my sister-in-law. Always warm and approachable, she treated me kindly, just like she did when we were kids. Her open and carefree attitude became intensely stimulating for me, a virgin, gradually breaking down the walls around my heart. As our daily routines brought us closer, our relationship deepened. This mix of warmth and innocence became my very first sexual experience with my sister-in-law.