Miki (Kaoru Mitsumune), Aya (Mika Kumagai), Megumi (Miyako Takayama) and Haruka (Yukiyo Sono) are friends in the same photography club at their university. They often spend their time together at "Tide-Pool" tea shop, run by Miki's parents. One month before they graduate, they girls plan a graduation trip, but Miki is unable to join due to her studies. Also, Haruka lost the girls' trip money. They all make up, but next month they'll go their separate ways. Miki feels empty ...
911 receives a call from a young woman reporting the death of an acquaintance at a hotel, and Detectives Ushio and Ogami of Shinjuku West Police Station rush to the scene!! The caller is eventually identified as Megumi, a woman whom Detective Ushio's wife Sumie had met by chance, but Megumi too has been killed...
Iwatsuki Reiko, a writer for a weekly magazine goes on a trip to Amakusa, Kyushu with Yukitake Asami, the president of a company. Yukitake informs Iwatsuki that she has many enemies.
