At a private American high school, school beauty Olivia stumbles on a Weight Transfer System: all calories she eats shift to her classmate and neighbor Lyla. Olivia stays effortlessly slim, becoming cheer captain, while Lyla balloons uncontrollably and endures bullying, cyberbullying and her mother’s criticism. In despair, Lyla unlocks its reverse skill, Fat Backflow — every pound she loses makes Olivia gain three. She trains hard, and Olivia’s perfect image falls apart. Olivia tries to force Lyla to regain weight by tampering with her food, force-feeding her and spreading rumors. Lyla presents her evidence at the Homecoming dance and exposes the truth. Olivia is disgraced. When the system fades, it permanently improves Lyla’s metabolism, freeing her from obsession with weight.
