Mai is a beautiful and serious teacher who is passionate about education. One day, she witnesses Kawagoe, a student at the same school who is a problem child with bad behavior, committing a crime. Mai scolds Kawagoe, who takes a disrespectful attitude, so Mai slaps him. She tells him, "If you mess around too much, I'll take appropriate action," and leaves the scene. Kawagoe, who was scolded, feels belittled and is filled with anger. Then, together with a thug senior, he comes up with a shocking plan. Kawagoe calls Mai and says, "I want to apologize." What will happen to Mai, who believes his words?