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.
| Directing | Takashi Shimizu | Director |
| Writing | Takashi Shimizu | Screenplay |
| Writing | Rumi Kakuta | Screenplay |