In the seemingly ordinary daily life of two sisters, an unnerving dynamic unfolds. The older sister, Nii, harbors an obsessive and destructive devotion to her younger sibling, Mero. When Mero casually mentions a preference for bread over the onigiri Nii had prepared, Nii immediately throws the rice balls away without a second thought. If Mero expresses a whimsical desire for eyes that shoot beams, Nii earnestly begins developing a scientific solution. Nii strives to fulfill every single wish Mero voices, no matter how absurd, seeing it as her sole purpose. However, this absolute compliance has one glaring exception: Mero is never allowed to go outside. The conflict arises from the fact that Mero is no ordinary little sister. Beneath her sweet and innocent facade, she conceals a terrifying and dangerous power. The older sister's overprotective refusal to let Mero leave their home is not mere possessiveness but a desperate measure. What begins as a twisted comedy of sisterly love quickly escalates, as Mero's quiet longing for the outside world threatens to trigger a catastrophe that could engulf the entire world. The narrative follows this delicate, unstable balance, where Nii's frantic attempts to keep Mero happy and contained clash with Mero's growing curiosity and her inherent, world-ending potential.