After living separately from her husband on a single assignment, Yoko's only son, Ken, began to behave badly, and Yoko was heartbroken. Dissatisfied with everything, Takeru's quarrelsome personality was disliked by his classmates and finally caused a "rebellion". After being betrayed by the friends he trusted, Ken is so shocked that he transfers to his father's job away from home. However, the tragedy does not end there.
