Viper V-6 is the first in the long-running Viper series of animated adult games. It contains three separate stories:
1. "The Devil Came" tells the story of a teenager named Ogawa, who was unpopular in his class and summoned a demon to exact revenge. But the demon turned out to be female, so his wishes naturally assume a different direction...
2. "Afternoon" describes a scene during a beauty contest. The defeated participant thinks that she was unfairly judged, but her fury at the winner turns, in front of the amazed spectators, into erotic desire...
3. "Double Impact" features two young female detectives, Miho and Kumi, who pretend to search for jobs as maids in order to infiltrate a mansion in which mysterious disappearances have been taking place.
