In the cyber city of Tom Sawyer, society centers on accumulating "Love," which functions like social media likes. Citizens of this augmented reality trade Love for public services and appearance-altering avatars through the Decoration Customizer, or "Deco," a holographic device implanted in their eyes during early childhood. Under the government's strict oversight, the residents of Tom Sawyer enjoy a peaceful life, aside from the sporadic emergence of Phantom Zero, a mysterious criminal who reduces all Love to zero in their immediate area. Berry, a mischievous girl captivated by Phantom Zero, lives comfortably within Tom Sawyer's system until her Deco malfunctions, allowing her to see a camouflaged prankster named Hack. Mistaking Hack for Phantom Zero, Berry pursues the suspect and, in doing so, starts to reveal society's most closely guarded secrets. It emerges that Hack is not the only individual operating outside the system's rules—and the vibrant hues of Tom Sawyer conceal a darker reality.