Evelyn, who grew up in an orphanage in a small town, was bound to a strange System as a child. Even its name was bizarre: the Sex Queen Training System. It forced her to date men and even take things further.
Evelyn had always longed for pure love, so she refused. Unable to get any intimacy points, the System spent every day picking out candidates for her harem.
Then Evelyn arrived in Bludhaven to fulfill her mentor's dying wish: helping teach math to the orphans at St. Bernardine's Church. On her first night there, she accidentally opened a box hidden inside a secret compartment. Inside was an antique handgun. To her surprise, a strange ghost began haunting her. From then on, every night she might lose control and turn into a ghost bride, floating around with a gun in her hand.
System: If you don't date anyone, just wait until this ghost drives you to ruin one day. You'll end up in prison or in hell!
Ghost: No man who is unfaithful in love or toys with people's feelings will walk away from me alive.
Evelyn looked at the romantic prospects the System had picked for her and said, "No way. He's too much of a flirt. I believe in staying faithful in love."
The heroine may have exes, since this is a romance System, but the author has no romantic history, and neither will she have many. The hero's romantic history? You know how it is.
Theme: Love means being faithful, no matter what!