Honoka Sakura is a teacher dedicated to safeguarding stability within her school environment. When a new chemistry teacher transfers in, she greets his arrival with skepticism, prompted by concerns about his character. Her subsequent investigation uncovers his history of engaging in sexual relationships with students at his former institution. Viewing him as a threat to student safety, Honoka chooses not to report him formally. Instead, she leverages this knowledge to blackmail him, seeking to exert control over him and mitigate the threat he poses.