Mayu Horisawa was an exemplary student in Tokyo, excelling both academically and athletically—a model student admired by her classmates. One day, while exercising alone on the school rooftop, she witnessed Meguro, a delinquent classmate, using legal drugs. When she tried to reprimand him, teacher Nakata appeared and scolded Mayu instead. Soon, it became clear that Nakata was no better—a corrupt, immoral teacher. Both men developed a twisted interest in Mayu, and on the day before summer break, they lured her under the pretense of discussing her college prospects, then kidnapped and imprisoned her. The story unfolds as a complex web of relationships between an honor student, a corrupt teacher, and a troubled youth, revealing intense conflict, drama, and cruelty.