By day, I’m timid and submissive in the real world. By night, in the underworld, I hit hard. Other people who work for the underworld either catch ghosts or hunt demons. I work as a guard by the Bridge of Helplessness, responsible for keeping order. When I run into an uncultured thug, I beat him up in my security uniform! When I run into an educated thug, I take off my uniform and chase him down to beat him up!
The daytime storyline focuses on daily life and stays closer to reality. The nighttime storyline, after midnight, follows my adventures working in the underworld.
The first five chapters lay the groundwork for everything that follows.
There is a female lead, but no harem. The System only exists in the work storyline and is used solely for explanations and statistics.