Cousin Report: Throbbing Lewd Heat.

Sakura, who had been accepted to a local university, was still a virgin. Her curiosity about sex grew as she spent the days leading up to her entrance ceremony. Her homeroom teacher, Masami, who had been a good confidante, got engaged and moved away. Her other confidante, her cousin Momiji—who would be a senior at the same university—wasn't a virgin despite her limited experience. She was biding her time, waiting for an opportunity to confess to Heikichi, the manager at her part-time job. One day, Sakura was confessed to by her classmate Mitsuaki, who was also moving to Tokyo for university. They went to a hotel and quickly had their first experience. For Sakura, it involved more pain than she had imagined. Mitsuaki wanted a long-distance relationship, but Sakura couldn't handle it. At the university entrance ceremony, Masami, who came to see Sakura in her ceremonial attire, was troubled by her decision to quit teaching and marry Yukiyoshi.