Ichika Matsumoto and I have been close friends since childhood, and when we grew up, we both attended the same high school. During puberty, we were both curious about sex. Even though I had a girlfriend, I couldn't do anything because I was too shy, and Ichika didn't have a boyfriend, making it even more difficult. Many times, Ichika expressed a desire to share with me about sex, and we both agreed to explore that topic together. We arranged to meet at my place and started that conversation…