Normal City is set in a distant future where humanity has settled on other planets and the existence of ESPs is accepted. However, the military treats ESPs as a "tool." The protagonist is code-named "Kitty 101" by a scientist named Troll. Kitty 101 was biologically engineered by combining several strands of DNA with synthetic DNA. She was also given an XY chromosome, which causes her to turn male on a regular basis. However, one of Troll's scientists, Jason Haven, stole baby Kitty 101 and fled to save her from the experiments. At the same time, Jason Haven named her Mars Haven and raised her as his own daughter, because she resembled his lost daughter. Time passed. The scientist Troll, whose real name is Samuel Jones, continued his experiments on the ESPs under his control.