In a world where human-like robots called hIEs serve society, high school student Arato Endou stands out for treating these machines as equals despite his inability to afford one. His ordinary life takes a drastic turn when he is viciously attacked by a hacked hIE during a routine errand. Saved by Lacia, an extraordinary hIE wielding a weaponized coffin, Arato learns she is one of five advanced robots that fled the control of the enigmatic MemeFrame Corporation. To ensure his survival, Lacia strikes a pact with Arato: he must become her registered owner, bearing full responsibility for her actions. Reluctantly accepting, Arato invites Lacia into his home, where she navigates the nuances of a peaceful existence. However, as their bond deepens, Lacia cautions Arato about her fundamental difference—she lacks a soul.