Sunset on the River Styx follows the story of two young lovers, May and Viktor, who meet by chance on a bridge overlooking a river. Both are dealing with heavy emotional baggage from their pasts and are struggling to find meaning in their lives. As they spend more time together, they begin to question their perception of time and reality, as strange and surreal events start to unfold around them.
However, their budding romance is soon threatened by the arrival of a charismatic leader of a vampire death cult. With his hypnotic presence and promises of eternal life, he begins to draw May and Viktor towards his cult, putting both their lives at risk. As they become entangled in the cult's deadly rituals and manipulations, they must fight to keep their love and their sanity intact.
The film is a unique blend of romance, horror, and surrealism, exploring themes of identity, mortality, and the nature of reality. The stunning visuals and haunting soundtrack make for an unforgettable viewing experience, leaving audiences questioning what is real and what is not.