Within a desolate world ravaged by nuclear disaster, Lily resides in an underground cavern alongside Selene, a multi-generational android companion. For nine years, these two unlikely companions have found solace in each other's presence amidst the solitude. Despite the bleakness of their surroundings, both Lily and Selene cling to the shared dream of a future where life can thrive beyond their subterranean refuge. Yet, this aspiration is tinged with the harsh reality that only Selene possesses the immunity to venture into the lethal exterior environment, making their yearning for a brighter tomorrow a precarious hope to uphold.