While the story of St. John's Wort is something I could easily imagine coming out of Hammer Films, or a classic Vincent Price movie, it's not BAD, and the visuals more than make up for it.
PLOT: Nami inherits a spooky old mansion, takes her ex-boyfriend along so they can scope out using the place as a setting for their video game. Turns out she may have had a twin who died when she was a child. Also turns out her father was a crazy artist, who painted creepy pictures. Is the house haunted? Is the twin still alive? Who is the spooky caretaker? See what I mean by it being very Vincent Price-ish? Anyway, the plot is fairly solid, though I did find at least one of the ending plot twists useless and incomprehensible, but since it really affected nothing else in the film, I ignored it.
The VISUALS, on the other hand...
The whole movie is oddly colored, which is unsettling to begin with, and which makes sections of it look like they might be CGI, or bluescreened, or might just be badly tinted - all adding to the unreality of the whole thing. Also, the camera "view" keeps shifting, from "reality" to the ex's hand-held camera, to B&W surveillance cameras, and even to a "video game version".
My favorite bit of unreality involves the caretaker - when they arrive at the place, the caretaker gives Nami the keys, but the scene is played out as a video game sequence, with the caretaker icon's lines being printed on the screen, rather than spoken - thus making it impossible to determine anything, even gender, about this "person".
Overall, I found it very watchable.