Asuka Aka was a very pretty teacher, and lots of students liked her. One of them was Nagata, a quiet and shy boy who started to like her more and more. He couldn't stop thinking about her and drew pictures of her in his notebooks.

But one day, Nagata found out a secret: Asuka was dating another teacher. This made him really jealous and sad. He realized that he had no chance with her, and this made his love for her turn into something bad. He couldn't think clearly because of his obsession, and he did something really shocking and awful that hurt a lot of people in the school.