Fukami, a secretary engaged to company president Kaido, her employer, is invited by his close friends, the Nogis, to a three-day-two-night tour. The tour group is traveling in a luxurious coach to Lake Megami in the Tateshina Plains. On the way, they are disturbed to hear that Shirai, a hostess who was supposed to come along on the tour, has been murdered. And the next day, the body of Hasegawa, another tour member, is floating in Lake Megami...
| Directing | Minoru Matsushima | Director |
| Writing | Kyoko Hara | Screenplay |
| Sound | Takahiko Ishikawa | Original Music Composer |
| Editing | Osamu Inoue | Editor |
| Sound | Hisayuki Miyamoto | Sound Recordist |
| Production | Miyo Akiyama | Producer |
| Camera | Kenichi Nakagawa | Director of Photography |
| Lighting | Takeshi Tajima | Lighting Technician |
| Directing | Masatsugu Takeyasu | Assistant Director |
| Production | Megumu Iwanaga | Producer |
| Production | Eisuke Shirasaki | Producer |
| Art | Yoshikazu Furuya | Art Direction |
| Sound | Nobuo Komine | Sound Mixer |
| Camera | Toshiyasu Imoto | Still Photographer |