Early summer, Keiichi had just moved to a remote mountain village. As he becomes close friends with a group of girls, he was enjoying his life in the village. However when he starts to become suspicious that his friends may be deeply involved in successive murders that occur every summer, the situation around Keiichi gradually starts to turn into something more sinister.
| Directing | Ataru Oikawa | Director |
| Art | Takashi Matsuzuka | Art Direction |
| Costume & Make-Up | Mari Miyamoto | Costume Design |
| Writing | Ataru Oikawa | Writer |
| Writing | Ryūkishi07 | Novel |
| Camera | Kazuhiro Shirao | Director of Photography |
| Editing | Yusaku Takizawa | Editor |
| Sound | Kenji Kawai | Music |
| Sound | Eiko Shimamiya | Theme Song Performance |
| Lighting | Noboru Miyashita | Gaffer |