Mind Over Matters

Jim is a high school student. He finally manage to make it into Lakeview High School, the top magnet school in town.
He then discovers that there's a club at Lakeview. To get in the club, you have to be in the top 10% scholastically at Lakeview. Jim makes it into the club. It turns out that the club has a game that members must play. It's some sort of adventure game. The student plays a role in the game. The role that the student plays is pretty much set by the game, but the abilities of each character in the game are determined by the strength of the player’s mind and not by any preset rules.
The game involves sword fighting and is played to simulated death.
Jim is a city champion fencer and he plays the game and wins. However, he doesn't kill his female rivals, he forces their game character to strip to nude and then do what he wants.
The game continues through several girl challengers and quite a bit of action.
Then, the girls try a trick and Jim sees his chance to build a new life on the game.