One day, I stopped going to school after an incident—my first sexual experience with my girlfriend. Back then, I didn't know anything about sex and felt deeply embarrassed, which completely changed our relationship. Ashamed to face her in class, I skipped school for two long weeks. Then, my homeroom teacher and PE instructor, the passionate Ms. Nanami Matsumoto, came for a home visit. With my parents absent, she was supposed to leave, but instead, she seized the opportunity and entered my house. I honestly confessed my troubles, hoping she'd quickly let me off the hook. But Ms. Matsumoto took it seriously, giving me an intense, heartfelt lesson in adult sex education. Her warm yet fiery guidance brought a profound change to my heart.