After Qin Tian was accidentally killed by a truck driver in his previous life, he transmigrated into a crossover world and bound himself to the [Fantasy Creation System]. By converting a world's origin, he can gain energy points and use them to create anything. So Qin Tian turned his attention to the original characters.
"If you ask me, those original characters are all infused with their world's origins. They're perfect leeks to harvest."
Using the System, he creates dream spaces and turns the plots of various anime, games, and movies he saw in his previous life into dream-game scenarios, inviting the original characters to take part. While they sleep, he skims off a little of their world's origin to fuel himself. He also spends a little energy to manifest all kinds of "treasures" as rewards for participants.
And so... Why is a certain conglomerate heiress striking a strange pose with her attendant late at night? Why is a pink-haired, socially anxious girl summoning demons in public? Why does the Service Club keep making slurping noises, and why is its door always frozen shut?
One original character after another is invited in their sleep, forced to suffer and enjoy themselves in the dream-game scenarios Qin Tian created...
P.S. Harem story. Don't read if that's not your thing.