Misao is a female teacher with a mysterious aura who has arrived at this school after a series of previous postings. Shinji, one of her students, falls in love with her at first sight and fantasizes about raping her. Although Misao lives with a man named Takuro—whom she believes to be her father—they are not actually related; in reality, she was abused and abandoned by her biological father, and she simply came to view Takuro as her dad. Takuro is actually a special investigations detective working undercover as a laborer, and the truth about their relationship has been kept from her. One day, Shinji threatens Misao with a knife, attempting to force himself upon her...