A kid rebuilds her dead sister as a robot and has to learn that the thing she created isn't the person she lost. The show knows this is devastating. It also knows it's funny, Peta Robo's malfunctions land harder because you're already invested in Null's desperation to make this work. Twelve episodes is enough time to break your heart and put it back together differently, which is exactly what this show does.
Null is a brilliant child inventor living a relatively normal life until tragedy strikes: her older sister Peta dies in an accident. Grief-stricken but refusing to accept that loss, Null channels her genius into an impossible task. She builds a robot version of Peta and brings her back, creating an artificial sister who looks the part but operates in ways the original never did. The robot Peta is unpredictable, sometimes childlike, sometimes unsettlingly mechanical in her responses to everyday situations. What unfolds is a strange comedy about two sisters learning to coexist in this new reality. Null grapples with whether she's truly brought Peta back or simply created something wearing her sister's face. Meanwhile, Peta Robo navigates a world she doesn't quite understand, developing her own personality in the process. The show balances comedy with genuine emotional weight, asking what it means to love someone who isn't quite who they used to be. Inventive, quirky, and surprisingly touching, it's about acceptance, grief, and the messy reality of second chances.