Zanki Zero: Last Beginning
God created the world in seven days. It only took one for humans to destroy it. Life as we knew it sank to the depths of the sea...until yesterday. We do not yet know this broken world or the reasons for its downfall left behind here. An earth where ruins drift about, with remnants of buildings, cars, traffic lights... Modern civilization was destroyed, becoming nothing more than debris wading in the sea. New ruins drift one after the other before our very eyes, the survivors who live on one of those decaying islands.