Three couples are staying at a lakeside cottage with their children. They want them to prepare intensely for a prestigious high school's entrance exam with the help of a private tutor. One night, one of the wives confesses to her husband that she has killed his mistress.
| Directing | Shinji Aoyama | Director |
| Camera | Masaki Tamura | Director of Photography |
| Production | Hiroyoshi Koiwai | Executive Producer |
| Sound | Nobuyuki Kikuchi | Sound |
| Writing | Masaki Fukasawa | Writer |
| Writing | Keigo Higashino | Novel |
| Editing | Shinji Aoyama | Editor |
| Art | Tsuyoshi Shimizu | Art Direction |
| Writing | Shinji Aoyama | Writer |
| Production | Takenori Sentô | Producer |
| Sound | Hiroyuki Nagashima | Original Music Composer |