A tropical fish store in Fujimi City is home to the Shamoto family of three. The head of the household, Shinsuke (played by Mitsuru Fukikoshi), married the beautiful Taeko shortly after his wife died, which greatly displeased his daughter Mitsuko. Therefore, the atmosphere at home is always depressing and dignified, and Taeko is even more cautious, fearing that she will cause trouble. One night, Mitsuko was detained by the supermarket for stealing, and the Shamoto couple hurried to go there. Thanks to the enthusiastic stranger Yukio Murata, they were able to get away. Murata is also the owner of a tropical fish store. He sincerely invited the Shamoto family to visit his store and was willing to hire Mitsuko as an employee. Although the Shamoto couple was a little at a loss, they were unconsciously led by Murata. Soon after, Murata invited Shinsuke as a partner, but he actually killed a man who questioned him in front of Shinsuke. Shinsuke, who has always been timid, is forced to become an accomplice of the crazy Murata in destroying corpses... This film is adapted from the Saitama dog-loving family serial killings that shocked Japan in 1993.