Overview
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.
| Actor | Age then | Age now | |
|---|---|---|---|
 | 27 | 29 | |
 | 17 | 18 | |
 | 19 | 20 | |
 | 18 | 19 | |
 | 31 | 33 | |
 | 48 | 49 | |
 | 54 | 55 | |
 | 23 | 25 | |
 | 18 | 19 | |
 | 30 | 31 |