Zetcho: The Acme (1997)

The man was seeking pleasure beyond sex. And the ultimate ecstasy he sought was pace poles and the death throes of a person. The man drags his friend Shinichi and his girlfriend Akiko into his world of madness, gradually corrupting their relationship and manipulating them. Then, he murders Shinichi in front of Akiko. Akiko's mind and body collapse from the shock, and the man toys with her for his own pleasure. However, Akiko's mind gradually becomes abnormal, and she enters a world where madness can be sanity.