Soratobu Mogura

A century has passed since a vast, encroaching sea of acid swallowed the surface of the earth, forcing humanity to abandon the upper world and seek refuge deep underground. Yet, even this desperate measure has finally reached its breaking point. Now, another subterranean nation faces imminent doom as the toxic tide threatens to consume their last remaining sanctuary. Set against this bleak backdrop of societal collapse, this poignant narrative chronicles the tragic end of a single nation and the profound trials of a family caught in the final hours of their world.