Zhen Shi, who knows a little bit of everything but is content with an ordinary life, finds himself in the body of a mechanical girl and transmigrates with her to a medieval otherworld full of monsters and magic.
The possession is only half complete. The mechanical girl's consciousness remains, and she and Zhen Shi fight over control of the body.
It turns out Zhen Shi controls the combat functions, while the mechanical girl has almost no common sense about everyday life and can't do anything on her own. In any situation, she has to rely on Zhen Shi to act.
Gradually, the girl develops feelings of her own, while Zhen Shi also changes during their journey.
By the time they realize it, the two are in too deep to turn back, and the conspiracy surrounding the world has long since become inextricably tied to them.
