![](https://image.tmdb.org/t/p/w300/omVmX0xQzViFo462KuXsTpUhGnq.jpg)
Who is that girl?
During the summer vacation period, temporary teacher Honoka Kimijima is in charge of a supplementary class. One day, a female student suddenly jumps off from the school rooftop and dies in front of Honoka Kimijima. Then she notices a mystery student who is not supposed to be there.