Kiyoko Tominari learns that her childhood friend Tommy and his girlfriend Sachiko are going to study at her high school.
Unfortunately, she had cut ties with him four years ago and still hold grudges towards him because he betrayed her and hurted her feeling.
She then decides to write again in her childhood diary to express her sorrow and anger.
But Kiyoko, who imagines that nothing can be worse than sharing high school with the two people she hates the most in the world, is not at the end of her sorrow...