Masato Irie is a 33-year-old teacher living an ordinary and peaceful life with his wife and child, cherishing the small happinesses of his family. This quiet existence is shattered when he has a shocking encounter with a beautiful young woman who turns out to be one of his own pupils. As the student's obsessive love for him intensifies day by day, Masato finds his personal and professional life thrown into chaos, with his fate being dangerously derailed by this forbidden relationship. The story unfolds as a dramatic and suspenseful thriller set within a contemporary school environment, exploring the psychological consequences of a teacher being relentlessly pursued by a student who refuses to accept the boundaries between them.