The goddess Ania created the Guardian Servant System to manage the world's purging operations on her behalf. The goddess got the idea from a mobile game she'd played called FGO. Ania is a fanatical devotee of the game.
Kamishiro Rin is an unremarkable high school student whose heart is shattered after a failed confession. His childhood friend's concern can't cheer him up. Then, as if things couldn't get any worse, Rin dies in an accident. The goddess captures his soul, and to survive, Rin accepts Ania's offer, becoming a Guardian Servant and receiving a new girl’s body. After this, Kamishiro Rin changes her name to Kamishiro Rinko, and her brand-new life begins...
